During fair weather, the net movement of sand perpendicular to shore is offshore, which means it moves away from the beach. This phenomenon occurs due to a combination of factors related to weather and wave activity.
In fair weather conditions, waves approach the shore at an angle, which leads to a process called "swash and backwash." Swash refers to the water washing up onto the beach, carrying sand and other sediment with it. Backwash is the water flowing back down the beach, pulling sand and sediment back towards the ocean. When waves break at an angle, they create a zigzag pattern of sand movement, known as longshore drift. However, in fair weather, the dominant wave direction is typically perpendicular to the shore, minimizing the longshore drift effect.
The balance between swash and backwash results in the net movement of sand being offshore. To further explain, as waves break near the shore, their energy dissipates and the offshore-flowing currents carry the suspended sand and sediment away from the beach. This offshore movement of sand can lead to the formation of sandbars, which are underwater ridges of sand that parallel the shoreline.
In summary, during fair weather, the net movement of sand perpendicular to shore is offshore due to the combined effects of swash and backwash, wave angle, and offshore-flowing currents. This results in sand being transported away from the beach and can contribute to the formation of sandbars.
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During fair weather, the net movement of sand perpendicular to shore is offshore, which means it moves away from the beach.
This phenomenon occurs due to a combination of factors related to weather and wave activity.In fair weather conditions, waves approach the shore at an angle, which leads to a process called "swash and backwash." Swash refers to the water washing up onto the beach, carrying sand and other sediment with it. Backwash is the water flowing back down the beach, pulling sand and sediment back towards the ocean. When waves break at an angle, they create a zigzag pattern of sand movement, known as longshore drift. However, in fair weather, the dominant wave direction is typically perpendicular to the shore, minimizing the longshore drift effect.The balance between swash and backwash results in the net movement of sand being offshore. To further explain, as waves break near the shore, their energy dissipates and the offshore-flowing currents carry the suspended sand and sediment away from the beach. This offshore movement of sand can lead to the formation of sandbars, which are underwater ridges of sand that parallel the shoreline.In summary, during fair weather, the net movement of sand perpendicular to shore is offshore due to the combined effects of swash and backwash, wave angle, and offshore-flowing currents. This results in sand being transported away from the beach and can contribute to the formation of sandbars.
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10) Sediments produced because of chemical reactions in seawater are called ________. A) biogenous
B) cosmogenous
C) lithogenous
D) hydrogenous E) volcanogenic
Sediments produced because of chemical reactions in seawater are called hydrogenous. Option D is the correct answer.
Chemical processes in saltwater produce hydrogenous sediments. In saltwater, dissolved compounds can precipitate under specific chemical circumstances. Economic value exists in a variety of hydrogenous sediment types. Gypsum and halite are the two most prevalent forms of evaporating substances. Gypsum, which is hydrous calcium sulfate, is mined all over the world and used to create cement, plaster, and fertilizer. Sodium chloride, or halite, is regular table salt. Option D is the correct answer.
Evaporites, or any sediment that results from the evaporation of seawater, are considered to be hydrogenous deposits. The ions left behind after saltwater evaporates may become so concentrated that they will combine to form crystals when they precipitate. Option D is the correct answer.
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An important programme was to be broadcast from Mumbai at 7:30 p.m. This was heard by
some Indian sailors near Ivory Coast in West Africa at 20°W longitude. What was the local time
there?
Assuming both places are in the same time zone, the local time in Ivory Coast when the program was broadcast at 7:30 p.m. in Mumbai would be roughly 1:11 a.m. the following day (7:30 p.m. + 17.81 hours). Ivory Coast and India, however, are in various time zones, which is something to keep in mind.
The president of the Ivory Coast is bestowed with significant executive authority. It was a major economic force in West Africa during the 1960s and 1970s thanks to the production of coffee and cocoa,
but the 1980s saw an economic crisis that contributed to a period of political and social unrest that lasted until 2011. Since the restoration of peace and political stability time zones in Ivory Coast in 2011, the economy has grown rapidly once more. from 2012 until 2021
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Question 67
One of the most common reasons for the contamination of wells drilled through rock, clay or hardpan is
a. Seepage of pollution through the soil
b. Failure to seal well casing properly
c. Porosity of the rock
d. Use of inferior quality well casings
One of the most common reasons for the contamination of wells drilled through rock, clay or hardpan is Failure to seal well casing properly. The correct option is b.
It's essential to correctly seal the well casing after drilling to prevent tainting the water supply. A pipe known as a well casing is inserted into the hole to prevent the sides of the bore hole from collapsing while still allowing water to flow into the well.
Inadequate well casing sealing can allow soil or rock contaminants to seep into the well, contaminating the water source.
However, one of the most common causes is improper well casing sealing. Other potential causes of well contamination include the use of subpar well casings and porous rock. The correct option is b.
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a pater noster lake is the name for a glacier-cut valley partly flooded by the sea. T/F
False.
A "pater noster lake" is actually a term used to describe a chain of small lakes or ponds in a glacial valley. It is not related to a valley that is partly flooded by the sea.
A pater noster lake is a series of small, interconnected lakes or ponds found in a glacial valley. The name "pater noster" comes from the Latin phrase for "Our Father," and refers to the way the lakes resemble a string of rosary beads. Pater noster lakes are formed when a glacier retreats and leaves behind depressions in the landscape. Over time, these depressions fill with water from melting snow and ice, forming a chain of small lakes or ponds. The lakes are typically connected by small streams or channels, and they often have a distinctive oval or circular shape. Pater noster lakes can be found in many parts of the world, including Europe, North America, and Asia. They are often surrounded by steep, rocky cliffs and are home to a variety of plant and animal life.
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The given statement "A pater noster lake is indeed the name given to a glacier-cut valley that has been partially flooded by the sea" is true.
This type of lake is characterized by a series of interconnected basins that are linked together by narrow channels or outlets. The name "pater noster" comes from the Latin phrase for "our father" and is thought to refer to the shape of the interconnected basins, which resemble the beads of a rosary. These lakes are formed by the movement of glaciers, which carve out deep valleys in the landscape. As the glaciers retreat, sea levels rise and fill the lower parts of the valleys with seawater. The resulting landscape is a unique blend of mountains, valleys, and coastal features, with a rich variety of plant and animal life.
Pater noster lakes are found in many parts of the world, including Norway, Canada, Greenland, and New Zealand. They are often popular tourist destinations, as they offer a glimpse into a unique and beautiful landscape that is shaped by the forces of nature. In addition, they are important habitats for a wide range of plant and animal species, many of which are unique to these environments.
Overall, the pater noster lake is a fascinating and beautiful natural phenomenon that showcases the power and beauty of the natural world. Whether you are a scientist, a nature lover, or simply someone who appreciates the beauty of the natural world, these lakes are definitely worth exploring.
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Which type of fog occurs during nights when skies are clear and relative humidity is high?
-radiation fog
-advection fog
-evaporation fog
-steam fog
The type of fog that occurs during nights when skies are clear and relative humidity is high is called radiation fog.
Radiation fog is the kind of fog that develops at night when the sky is clear and the relative humidity is high. When the earth rapidly loses heat after sunset, the air above it cools below the dew point, when water vapour condenses into small water droplets, producing this sort of fog.
Radiation fog can be highly dense, resulting in visibility of less than a quarter mile, and generally develops in valleys and low-lying places. After daybreak, it normally disappears as the sun warms the earth and the air above it.
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Suppose you have a strong peak at 2530 cm^-1. What is the wavelength of the radiation that was absorbed?
The wavelength of the radiation that was absorbed is approximately 1.19 micrometers (µm).
To calculate the wavelength of the radiation that was absorbed, we can use the following equation:
wavelength = speed of light / frequency
where the frequency is given by:
frequency = wave number x speed of light
The wave number is the reciprocal of the wavelength, expressed in inverse centimeters (cm^-1).
Therefore, to find the wavelength of the radiation that was absorbed, we need to convert the wave number to frequency, and then use that frequency to calculate the wavelength.
Given a strong peak at 2530 cm^-1, the corresponding frequency can be calculated as:
frequency = 2530 cm^-1 x (speed of light) = 2.53 x 10^14 Hz
Using this frequency, we can now calculate the wavelength of the radiation as:
wavelength = speed of light / frequency = 2.998 x 10^8 m/s / 2.53 x 10^14 Hz = 1.19 x 10^-6 meters
Therefore, the wavelength of the radiation that was absorbed is approximately 1.19 micrometers (µm).
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the eye of a hurricane has all of the following characteristics, except the eye of a hurricane has all of the following characteristics, except an average passage time of 5-10 minutes. relatively clear skies. light winds. descending air.
The eye of a hurricane has all of the following characteristics EXCEPT an average passage time of 5-10 minutes.
What is a hurricane?Hurricanes are an environmental issue that usually exists in the form of tropical cyclone. This is usually very serious and has a lot of damaging effects. The cgaracteristics that it has are strong winds, heavy rainfall and the surge of a storm.
The speed of the wind is another factor that is used to characterize it. The people that live in areas that are prone to hurricanes are monitored and always asked to prepare for the storms by having emergency plans in palce
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Which species do you think had more of an impact on people than on the environment
Answer:
Dogs: Dogs are another species that have had a profound impact on human societies. They have been bred and trained for thousands of years to assist humans in hunting, herding, and guarding. Today, dogs are also widely used as companions, service animals, and therapy animals.
Explanation:
What percentage of Earth's freshwater is accessible in surface rivers and lakes?
a) 1%
b) 10%
c) 30%
d) 70%
e) 97%
Which prevailing winds are changed to northeast monsoons by the effect of the Indian subcontinent? Explain how the winds are affected in December
The trade prevailing winds are changed to northeast monsoons by the effect of the Indian subcontinent.
These trade winds bring cool breeze, low humidity to the Indian subcontinent in December as they blow from the northeast in the direction of the equator. However, the geography of the area has an impact on these winds when they reach the Indian subcontinent.
The Bay of Bengal and the Arabian Sea contribute moisture to the northeast monsoon as it develops, resulting in heavy rainfall in the southern and eastern regions of the Indian subcontinent. For agriculture and the replenishment of water sources, this rainfall is essential.
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Question 4
In valleys and ravines, what method of landfilling is considered the best?
a. trench b. low area
c. area
d. wet area
In valleys and ravines, the best method of landfilling is the trench method.
Option A is correct
This involves excavating a trench or pit in the ground, filling it with waste, and then covering it with soil or other materials. The trench method is often preferred in valleys and ravines because it helps to minimize the amount of land required for the landfill and reduces the risk of erosion and landslides.
Additionally, the trench method can help to contain waste and prevent it from spreading to nearby areas, which is important in environmentally sensitive locations. Therefore, the correct answer is option a. trench.
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In valleys and ravines, the best method of landfilling is the wet area method. This involves placing waste in areas where the water table is high or where the soil is wet.
This method helps to limit the amount of leachate that seeps into the surrounding environment by taking advantage of the natural filtration provided by the soil and vegetation. The waste is placed in shallow layers and then covered with soil to allow for the decomposition process to occur. This method is considered to be more environmentally friendly than traditional landfilling methods and can help to reduce the negative impact of landfills on the surrounding ecosystem.
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bruno latour recommends that we focus on which part of our environment? group of answer choices oceans, rivers, streams, and waterbeds. the area several miles above and below earth's surface. the atmosphere. animal behavior.
Popular sociologist and science philosopher Bruno Latour is renowned for his writings on how people interact with their surroundings.
Bruno Latour might emphasise the interconnectivity of different factors in our environment rather than focusing on one particular feature, however I am not aware of any specific advice he has made. This is based on his general viewpoints.
The idea of "actor-network theory," which emphasises the agency and interconnections of both human and non-human actors in influencing social and environmental systems, is a recurring theme in Latour's work.
He would probably advocate for taking into account the connections and networks that exist between people, other non-human animals, and the environment as a whole.
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Folding can make a local mountain by _______.
Folding can make a local mountain by the horizontal compression of two or more layers of rock lying in the plate boundary. This usually leads to the formation of Fold Mountains at the point of convergence of the two plates through a process called Orogeny.
The process of folding occurs when two or more tectonic plates are continuously pushing against each other resulting in the formation of an enormous amount of force leading to the bending of rock layers instead of breaking. At a point when the strain becomes unmanageable, the layers of rock in the heavier plate get subducted and the layers of rock on the lighter plate thrust upwards resulting in fold mountains.
These mountains can reach incredible heights (e.g. the Himalayas) but at the same time, they are very much prone to various man-made disasters and natural disasters like earthquakes and landslides. This is attributed to the fact that they are very unstable geologically.
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how does volcanic eruption help in land formation?
Answer:
Yes, volcanic eruption does help in land formation.
Explanation:
A volcano is kind of a mountain that contains lava, fragments of rock, and hot gas. A volcano is likely to erupt at a given point in time.
When volcanoes erupt, they release molten magma or melted rock. This magma is originally present below the earth's surface. When magma flows on the earth's surface, it is known as lava.
The lava is hot. After some time, the lava cools down and solidifies on the earth's surface thus creating landforms.
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Groundwater accounts for what percentage of Earth's freshwater?
a) 3%
b) 20%
c) 30%
d) 75%
e) 97%
Why did people in different ancient Greek settlements have very little communication with each other?
People in different ancient Greek settlements had very little communication with each other for a variety of reasons.
The geography of the region made it difficult for people to travel from one settlement to another, which limited the amount of communication between them. Additionally, the language spoken by people in different settlements varied from one to the next, making it difficult to communicate with each other.
Furthermore, the lack of a unified political structure meant that different settlements had different rulers and laws, making it difficult to come together in any meaningful way. Finally, the lack of modern technology meant that it was difficult to share news, stories, and ideas, further limiting communication. All of these factors combined to create a situation where ancient Greek settlements had very little communication with each other.
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There are a few reasons why people in different ancient Greek settlements had very little communication with each other.
One reason is the geography of the region, which made travel difficult and time-consuming. Additionally, ancient Greece was comprised of many small city-states, each with its own government, culture, and traditions. These city-states often competed with one another, making communication and cooperation challenging. Another factor was the lack of standardized written language, which made it difficult for people from different regions to communicate effectively. Despite these barriers, there were still some forms of communication, such as trade, religious festivals, and the Olympic games, which brought people from different settlements together.
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In the future the birth rate and death rate will be balanced, so the total population will remain relatively constant.
Future birth and death rates will be equal, maintaining a reasonably stable overall population. As a result, the graph cannot be used to determine us.
The balance between birth and death rates controls population change. Population numbers will increase if the birth rate remains constant and the death rate declines. Population will grow if the birth rate rises while the death rate stays the same.
Because the population is roughly stable at carrying capacity, birthrates must equal deathrates, and population growth is zero. Due to virtually equal birth and death rates at the conclusion of the fourth stage, there is no population growth at this time. As a result, population growth starts to slow down.
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Correct Question:
In the future the birth rate and death rate will be balanced, so the total population will remain relatively constant.
which statement explains how nutrient-rich runoff can cause waters to become so hypoxic as to lead to major fish kills?
When nutrient-rich runoff enters a body of water, it can lead to a process called eutrophication. Eutrophication is the process by which excess nutrients, particularly nitrogen and phosphorus,
stimulate excessive plant and algae growth in water bodies. As these organisms die and decompose, they consume oxygen from the surrounding water, leading to a decrease in dissolved oxygen levels.This decrease in dissolved oxygen can create hypoxic conditions in the water, which can be harmful to fish and other aquatic organisms. Fish require oxygen to survive, and when the levels of dissolved oxygen in the water become too low, fish may suffocate and die in large numbers, leading to major fish kills.Additionally, the decomposition of dead organisms can produce toxic byproducts, such as hydrogen sulfide, that further exacerbate the hypoxic conditions and harm aquatic life.
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Nutrient-rich runoff can cause waters to become so hypoxic as to lead to major fish kills due to the process of eutrophication.
Eutrophication occurs when excess nutrients, primarily nitrogen and phosphorus, enter a body of water, leading to an overgrowth of algae and other aquatic plants. As these organisms die, they sink to the bottom and are decomposed by bacteria, which consumes the oxygen in the water. This depletion of oxygen in the water can create a hypoxic or anoxic environment, making it difficult for fish and other aquatic life to survive. The high levels of nutrients in the runoff often come from agricultural practices, such as the use of fertilizers and animal waste, as well as from urban development, such as stormwater runoff from roads and parking lots. When these nutrients enter the water, they stimulate the growth of algae and other aquatic plants, leading to an increase in organic matter and decomposition.
As the oxygen in the water is consumed by bacteria, fish and other aquatic life can suffocate and die. The severity of the fish kill depends on the size of the affected area and the level of oxygen depletion. In extreme cases, entire ecosystems can be damaged or destroyed. In conclusion, the excess nutrients in runoff can lead to eutrophication, which can result in hypoxic conditions and major fish kills. This highlights the importance of managing runoff to prevent the introduction of excess nutrients into our waterways.
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valles marineris is a wide, deep network of chasms stretching for some 2500 miles on the surface of mars. how do we believe such a big set of canyons formed originally? a. it was scoured out of the martian sands by the action of the regular dust storms b. it was caused by tectonic pressures from deep within the planet c. it was produced suddenly by flooding water some four billion years ago d. the canyons were places the ancient martians used for drag racing e. it was made by hundreds of impacts from space billions of years ago
Although space impacts may have helped to shape the Martian topography, they are not thought to be the main reason for Valles Marineris.
Valles Marineris is a massive system of canyons stretching for about 2500 miles on the surface of Mars. Scientists believe that it was formed by tectonic pressures from deep within the planet. It is thought that as the planet cooled and contracted, the crust cracked and moved, resulting in the formation of this huge canyon system. While there is evidence of water on Mars, it is unlikely that flooding water would have created such a wide and deep network of chasms. It is also unlikely that regular dust storms or drag racing by ancient Martians would have been responsible for the formation of Valles Marineris. While impacts from space may have contributed to shaping the Martian landscape, they are not believed to be the primary cause of Valles Marineris.
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astronomers originally found the existence of spiral arms in galaxies difficult to account for because
Astronomers originally found the existence of spiral arms in galaxies difficult to account for because they couldn't explain how these long, curving structures could maintain their shape over such vast distances and over such long periods of time.
However, with the development of better telescopes and new techniques for studying galaxies, scientists have been able to observe the motions of stars and gas within these structures, which has helped them to better understand how they form and evolve over time. Today, we know that spiral arms are caused by a combination of gravitational forces and the rotation of the galaxy itself, and they play an important role in shaping the overall structure and dynamics of galaxies.
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The ultimate base level is. A. any hard, resistant rock in a channel. B. a drainage divide. C. dependent on the geological substrate. D. a dam. E. sea level.
the visible light we see from the sun comes from which part
The visible light that we see from the Sun comes from its outermost layer, called the photosphere.
From which part comes the visible light?The photosphere is the visible surface of the Sun that emits light and heat due to the high temperatures and pressures in this region.
It has an average temperature of about 5,500 degrees Celsius (9,932 degrees Fahrenheit) and emits a wide spectrum of light, including visible light.
The visible light from the Sun consists of various colors, which, when combined, appear as white light to our eyes. This is the light that we perceive as sunlight and is responsible for illuminating our surroundings during the day.
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Since gaining independence in 1960, which conditions have been most common in the Democratic Republic of the Congo?
A. civil wars and dictatorship
B. democracy and poverty
C. democracy and economic prosperity
D. dictatorship and European control
Since gaining independence in 1960, the Democratic Republic of the Congo has encountered
A. civil wars and dictatorshipAffairs of Democratic Republic of the CongoIndeed, the country has confronted irregularities, battles, and ferociousness that have occasioned numerous fatalities and relocation of people. Patrice Lumumba, the first Congolese Prime Minister, was overthrown and barbarously suppressed merely months after the nation's freedom. Afterward, the nation faced decades of domination with Mobutu Sese Seko ruler for an extended span.
Moreover, even with Mobutu's abolishment, the nation has still not enjoyed stable authority with plentiful insurgent groups warring for power of geographical area and natural resources. In spite of its well-heeled mineral prosperity, the nation continues to be one of the most destitute of nations on earth plagued by destitution and dissimilarity throughout the country.
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What is the density of the most populous cities in the Northeast (Philadelphia, New York City, and Boston)?
A) less than 300 persons per square mile
B) approximately 250 persons per square mile
C) approximately 100 persons per square mile
D) more than 500 persons per square mile
The density of the most populous cities in the Northeast is approximately 250 persons per square mile.
The area had a total population of 57,609,148 as of the 2020 United States Census, which is 17.38% of the country's overall population. A geographical area of the United States is known as the Northeastern United States, often known as the Northeast. It is situated on the Atlantic coast of North America, bordered by the Southern United States to the south, the Midwestern United States to the west, and Canada to the north.
The Northeast megalopolis, which is located in the region and accounts for 67% of the 57,609,148 people living there, is home to several of the major metropolitan areas in the country, such as Boston, New York City, and Philadelphia. With 320 people per square mile, it has the highest population density in the whole country.
Therefore, option B is the correct answer.
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Most of the world's power is generated by
a) coal
b) oil
c) natural gas
d) nuclear
e) hydropower
The use of land for new construction within an already built up area refers to
a) urban infill.
b) urban reuse.
c) urban zoning.
d) urban replication.
Answer:
The answer is (a) urban infill.
Explanation:
Explain connections among low sulfur coal, atmospheric warming and toxic mercury.
Low-sulfur coal, atmospheric warming and toxic mercury are interconnected in various ways.
Low sulfur coal is a type of coal that has a low concentration of sulfur dioxide emissions when burned, which can have positive environmental effects by reducing acid rain and respiratory illnesses. However, low-sulfur coal often contains higher levels of toxic mercury, which is released into the atmosphere when burned.
Toxic mercury can contribute to atmospheric warming, which is caused by greenhouse gases trapping heat within the Earth's atmosphere. Mercury is a potent greenhouse gas, and its release into the atmosphere can exacerbate global warming, leading to increased temperatures and climate change.
Furthermore, atmospheric warming can have significant impacts on the environment, including the melting of polar ice caps and rising sea levels, which can lead to the displacement of millions of people and the destruction of coastal ecosystems.
In conclusion, low-sulfur coal may have some environmental benefits by reducing acid rain and respiratory illnesses, but its high levels of toxic mercury can contribute to atmospheric warming and exacerbate the effects of climate change. It is essential to reduce our reliance on fossil fuels and invest in renewable energy sources to mitigate the negative impacts of burning low-sulfur coal and other fossil fuels on the environment.
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the thermocline or area of rapid temperature change in the ocean is important because ________.
The thermocline or area of rapid temperature change in the ocean is important because it plays a crucial role in the oceanic circulation, which is an essential component of the Earth's climate system.
The thermocline is a layer in the ocean where the temperature decreases rapidly with depth, creating a barrier between the warmer surface water and the colder deep water. This boundary layer can act as a barrier to mixing between the two layers, which can have significant impacts on ocean currents and the exchange of heat and nutrients between the ocean and the atmosphere.The thermocline also influences the distribution of marine life in the ocean. Many species of marine organisms are adapted to specific temperature ranges, and the thermocline can create distinct habitats for different species at different depths.
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The thermocline in the ocean is an important factor because it marks a zone of rapid temperature change that is critical to the health and wellbeing of marine life.
This zone separates the upper layer of warm water from the colder, deeper waters below.
The temperature gradient at the thermocline can be quite steep, with changes in temperature occurring rapidly over a relatively small depth range. The importance of the thermocline lies in its impact on ocean currents and the distribution of nutrients in the water. The movement of water across the thermocline helps to create and maintain ocean currents, which play a crucial role in regulating the Earth's climate. The nutrient-rich waters that are found below the thermocline are essential for the growth and survival of marine life, including plankton and fish, which form the base of the ocean's food chain.
Changes in the temperature and location of the thermocline can have a significant impact on ocean ecosystems. For example, as temperatures in the ocean rise due to climate change, the thermocline may move further down, which could lead to changes in the distribution of nutrients and the movement of marine species. It is therefore essential to monitor and study the thermocline to understand how it may be changing and to develop strategies to protect and preserve ocean ecosystems in the face of these changes.
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What are four changes the mongol invasion brought to Russia?
Four changes brought by the Mongol invasion of Russia were :
Political controlEconomic impact Cultural exchange Military impactHow did the Mongol invasion affect Russia ?In the 13th century, vast parts of Russia fell under Mongol control following their conquest. The aftermath was felt in the Russian economy, which experienced disruption as a result. The imposition by the Mongols of onerous taxes triggered a decline in both agriculture and trade.
As an empire fusing various cultures, the occasion presented the opportunity for a significant cultural exchange between Russians and Mongols. In observance, the Russians adopted skills such as cavalry warfare and the deployment of composite bows used by their conquerors. This adaption had immense importance over their military tactics and served to ensconce their own formidable influence.
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Which planets are found in the Sun's habitable zone?
Earth is the only planet found in the habitable zone of the Sun.
A habitable zone is a region around a star where liquid water can exist on the surface of a planet. This region is neither too hot nor too cold. Earth is the only planet, out of all the planets of our solar system, which is found in the Sun's habitable zone. It is because Earth has liquid water on its surface and it is capable of supporting life.
Mercury and Venus cannot bear liquid water as they are too close to the Sun. Therefore, they are not in the Sun's habitable zone. Mars is too far from the Sun to be in the habitable zone. Earth is at the right distance from the Sun. It is far enough from the Sun which doesn't let all our water boil away, but close enough to it so that it doesn't freeze.
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