Answer:
Abrupt changes in the types of fossils, representing mass extinctions.
Which dating method would be MOST appropriate for establishing the age of a sedimentary rock layer from an early hominid site in eastern Africa
potassium-argon dating of volcanic rocks provides very accurate ages for many East African Rift Valley hominid sites.
Potassium-Argon Dating is a method of determining rock formation time by measuring the ratio of radioactive argon to radioactive potassium in the rock. This dating method is based on the decay of radioactive potassium-40 into radioactive argon-40 in minerals and rocks. Potassium-40 is also broken down into calcium-40.
The potassium-argon (K-Ar) isotope dating method is especially useful for dating lava. It was developed in the 1950s and was important for the development of plate tectonics theory and the calibration of geological time scales.
K-Ar dating Accurate dating from 4.3 billion years (age of the earth) to about 100,000 years ago. During 100,000 years, only 0.0053% of potassium-40 in rocks decayed to argon-40, pushing the limits of today's detectors.
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discuss the concept of optimum population. and factor for optimum population
Optimum population is when the population balances the standard of living in the area.
What is population?It should be noted that population simply means.the total number of people living in an area.
In this case, optimum population is the population that van effectively meat the needs of the people.
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Warm currents in the ocean create
more evaporation causing an
increased amount of
A. wind
C. seaweed
B. sea life
D. precipitation
the answer to your question is A
Answer:
C. Precipitation
Explanation:
So when more evaporation occurs, more water is in clouds which overall increase both the intensity and severity of a storm (adding more intense rain fall) to a area.
A richter magnitude 8 earthquake is ________ times greater than a richter magnitude of 7.
Answer:
10
Explanation:
Which heart rate zones are generally anaerobic in nature? Zones 1 and 2 Zones 4 and 5 Zones 2 and 3 Zones 3 and 4
The heart rate zones that are generally anaerobic in nature is : ( B ) Zones 4 and 5
ZONES 4 and 5Exercises carried out in these heart rate zones ( 80-100% of MHR ) are considered anaerobic in nature as the body because at this stage, The human body does not use oxygen as its source of energy/fuel, but uses the glucose stored in the muscles of the performer as a source of energy.
These heart rate zones can be attained by professional athletes.
Hence we can conclude that The heart rate zones that are generally anaerobic in nature is : ( B ) Zones 4 and 5
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Which volcanic hazard is most likely to cause destruction in towns located 30-60 kilometers away from a Cascade Range (very explosive) volcano
Lahars volcanic hazard is most likely to cause destruction in towns located 30-60 kilometers away from a Cascade Range volcano.
Lahar comes from Indonesian word which describe a mudflow or debris flow that originates on the slopes of a volcano. Small debris flows known to be very common within the Cascades, where they form in the times of heavy rainfall, rapid snow melt, and by shallow land sliding. These relatively small debris flows infrequently give way some miles down valleys. Inside the Cascades, the word lahar is normally reserved for larger events that occur in addition with volcanic eruptions, and travel many miles down valleys and affects the local communities. Lahars may occur by rapid melting of snow and ice during eruptions, by liquefaction of giant landslides (also called debris avalanches), by breakout floods from crater lakes, and by erosion from fresh volcanic ash deposits during heavy rains. Amid and immediately following volcanic eruptions, lahars can demeanor the foremost severe hazard to more populated valleys downstream from Cascades volcanoes.
So, the lahars volcanic hazard can cause destruction in towns located 30-60 kilometers away from a Cascade Range volcano.
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What is the number one reason
modernization of a country is slowed in
Southeast Asia?
A. conflict
B. trade
C. pollution
The best tool to use to compare the size of the continents is a
_____
Answer:
globe is the correct answer
hope it helps
During World War II Harry Hess discovered
A. earthquakes
B. trenches
C. volcanoes
D. igneous rocks
on the seafloor; evidence of seafloor spreading.
Write resources for human survival information.
Answer:
shelterFirefoodclothesSweet Girluilding and farming on a flood plain decreases the land's ability to absorb flood waters. True False
Answer:
True
Explanation:
If it's on a flood plain and is most likely already going to receive an influx of water but when it floods it could be too much water for the plants that it can either cause the crops to die or turn into a marsh area where building and farming would be almost impossible to keep up with.
This map shows the amount of groundwater (GW) in parts of Pakistan. Farmers in Pakistan once relied on rivers and canals for their water
supply, but as cities expanded and populations grew, more farmers used groundwater for their crops. When this map was made, there were no
laws restricting how many wells could be built in Pakistan to remove groundwater.
What would be the best solution to help Pakistan conserve their water supply?
eserved.
OA. Increase the number of groundwater wells in all three regions.
OB.
Build more wells in region 3, and restrict building in all other regions.
OC. Pass laws restricting well building in region 1, but increase wells in regions 2 and 3.
OD. Pass laws restricting all wells, with the fewest restrictions in Region 1.
IN
Reset
Next
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D
The best thing that Pakistan can do to conserve its groundwater is to D. Pass laws restricting all wells, with the fewest restrictions in Region 1.
How should Pakistan conserve groundwater?Restricting the construction of wells would ease the demand on the usage of groundwater.
All regions should therefore have these restrictions. As region 1 has the highest quantity of groundwater however, they can be subject to less restrictions because they can afford to use more water.
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Answer:
D.
Pass laws restricting all wells, with the fewest restrictions in Region 1.
A __________ is a geographic area where all the precipitation falls in the area and runs off into a river.
Answer:
A watershed or drainage basin is a gepgraphic area...
1. Consider the changes that the Colorado River
has undergone, especially as it relates to human
activity in the region and the environmental
effects of that activity. What social and cultural
actions are affecting the river?
2. What changes might the people living in the
southwestern U.S. need to adopt?
Match the city in column one to its description in column two
Answer:
Beijing to 'The cultural center of China; 2008 Olympics will be held here.'
Shanghai to 'The largest city; major economic and financial center; terrible pollution.'
Guangzhou to 'Third largest city; a port city and manufacturing center.'
Hong Kong to 'Capitalist economy; operates somewhat independently from China.'
Explanation:
These answers should be correct.
Hope this helps!
What is Relative Dating?
A. None of these
B. The science of determining the order of events in relation to each other, without a specific date.
C. The science of determining how long ago a specific ancestor lived.
D. The science of using radioactive isotopes to determine the specific age of a sample.
Answer:
B. The science of determining the order of events in relation to each other, without a specific date.
Explanation:
you can look it up on the Wikipedia and you see something similar to B.
Which weather-related phenomenon resulted in the most fatalities during the 30-year interval between 1977 and 2006
Answer:
floods
Explanation:
Microcredit loans typically are used to __________. a. buy a home b. start a small business out of one’s home c. improve infrastructure d. open a store or restaurant please select the best answer from the choices provided. a b c d
26. To get more detailed information about the current and predicted effects of the hurricane for your local area, you should
When we compare the catastrophic eruption in Sumatra 71,000 years ago and the 1991 eruption of Mt. Pinatubo, we find that __________. View Available Hint(s)for Part B When we compare the catastrophic eruption in Sumatra 71,000 years ago and the 1991 eruption of Mt. Pinatubo, we find that __________. they had opposite effects: the Sumatra eruption increased acid rain and the 1991 eruption decreased acid rain both eruptions caused a drop in the average temperatures across the Earth they had opposite effects: the Sumatra eruption caused cooling and the 1991 eruption increased average global temperatures the Sumatra eruption had a global effect, but the 1991 eruption only affected a small portion of the Earth
When comparing the catastrophic eruption in Sumatra 71,000 years ago and the 1991 eruption of Mt. Pinatubo, we find that "both eruptions caused a drop in the average temperatures across the Earth".
What is catastrophic eruption in Sumatra and in Mt. Pinatubo?The most recent Toba eruption was a supervolcano eruption that took place at the location of the present-day Lake Toba in Sumatra, Indonesia, some 71,000 years ago.
Reason for Toba eruption is-
The greatest known volcanic explosion on Earth in the last two million years, the Toba volcano eruption, produced a steep-walled crater that eventually became the source of the ancient lake. Supervolcanic eruptions are exceedingly unusual and massive eruptions like this one.On June 15, 1991, Mount Pinatubo in the Philippines saw the second-biggest volcanic explosion of this century and by far the largest eruption to affect a highly populated area. The eruption caused massive mudflows, high-speed avalanches of hot ash and gas, and a hundreds-mile-wide cloud of volcanic ash.
Reason for Mount Pinatubo eruption is-
More than 32 km (20 mi) of magma beneath Mount Pinatubo was surging toward the surface, causing tiny volcano tectonic earthquakes and massive steam explosions that blew three holes in the volcano's north slope.To know more about supervolcano eruption, here
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A glacier that had not changed its size or shape for a long time is now getting shorter. What does this tell you
Answer:
A glacier that had not changed its size or shape for a long time is now getting shorter. What does this tell you? Snowfall has decreased, or melting has increased, or both. it might be helpfulGlacier changing its size tells us that either melting has increased due to rise in temperature, or snowfall has reduced, or both.
Why glaciers are melting?
Many glaciers have been melting at an increasing rate since the early 1900s throughout the world. This phenomenon is primarily the result of human activity. Near particular, since the industrial revolution, emissions of greenhouse gases such as carbon dioxide have increased temperatures, even more in the poles, and as a result, glaciers are rapidly melting, calving off into the sea, and retreating on land.
Why snowfall is reducing?
More water evaporates from the land and oceans as a result of warmer temperatures, which increases precipitation, storm size, and precipitation variability in some regions. Generally speaking, a warmer temperatures results in more of this precipitation falling as rain rather than snow.
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Explain what water pollution is and state the human activities that causes water pollution.
The presence of harmful chemicals and biological agents in groundwater that go above and beyond what is normally present in the water and may be hazardous to the environment and/or human health is referred to as water pollution. Additionally, substances that have been added to water bodies as a result of numerous human activities might constitute water contamination. Regardless of the risk they may represent to the environment and human health, any quantity of harmful substances pollutes the water. Water pollution is a hideous problem all around the world that is caused entirely by human behavior. So, what would it take to stop or in the very least reduce the rate of significant water pollution? The answer includes creating and imposing laws on how waste is disposed on a large scale, such as factories and farms, as well as educating the overall public on what each person can do to contribute to the solution instead of the problem. The major causes of water pollution in today’s society are from household sewage, industrial manufacturing, and agricultural runoff. Laws such as Clean Water Act of 1972 have been helpful but now, half a century later it is in need of an overhaul to address the polluting sources not included in the original version. Examples of which include indirect source polluting from farm and residential runoffs that carry with them pesticides, household chemicals, and even pharmaceuticals right to the steams and oceans infesting marine life and drinking waters. The ultimate solution is to come at the problem from both ends, cleanup the waste that is already in the water systems throughout the globe, but more importantly stopping or at the very least significantly cutting down on the careless polluting practices currently in place. That is why it is vital to publicize this problem, educate on the causes and effects of society’s activities, and fight for creation and enforcement of stricter laws for waste disposals.
Which of the following landforms are labeled incorrectly?
Number 1 – the Pontic Mountains
Number 2 – the Taurus Mountains
Number 3 – the Anatolian Plateau
Number 4 – the Negev Desert
A. number 1 only
B. number 4 only
C. numbers 2 and 3 only
D. all are labeled incorrectly
Answer:
C
Explanation:
number 2 and 3 only are incorrect
Explain how connectivity has helped improve climate change.
Technology and connectivity have helped to improve climate change by improving techniques for using natural resources, such as solar and wind energy.
How does technology help climate change?The internet of things, for example, is a technology that helps, for example, in reducing carbon, promoting smart agriculture and new ways of using sustainable energy.
Therefore, climate technologies help to promote sustainability by using renewable energy and reducing the greenhouse effect on the planet, helping to protect the environment.
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onvergent plate boundaries are characteristic of Group of answer choices sea-floor spreading centers. collision zones between plates. lateral motions of plates. all plate boundaries.
Convergent plate boundaries are characteristic of B) collision zones between plates.
The place where the plate sinks is called the subduction zone. The type of convergence that occurs between the plates (sometimes called a very slow "collision") depends on the type of lithosphere involved.
The collision zone occurs when two continental plates move toward each other and collide. The land between the plates is forced upwards to form a fold. B. Alps and Himalayas.
The subduction zone is also created when two oceanic plates collide, pushing the old plate under the young plate to form a chain of volcanic islands known as island arcs.
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What is differential heating? evaluate the requirement that differential heating must take place before wind will blow. do any winds exist without differential heating?
The difference in warming refers to the change in the pattern of solar radiation received on the surface of the earth. We know that tropical latitudes receive more solar radiation than higher latitudes and poles. Therefore, this fluctuating solar radiation leads to different warming of the Earth's surface in different places.
Because the surface heating method is different, the air heating method is also different upwards. The higher the temperature, the lower the pressure, and the lower the temperature, the higher the pressure, resulting in a difference in air pressure. Therefore, the wind flows from high pressure to low pressure. Basically, it is the warming of different surfaces that causes the wind.
If there is no difference in surface heating such as water, land, low latitude, or high latitude, there is no pressure difference. Therefore, the wind has no gradient or flow. Therefore, without differential heating, there can be no wind.
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How many square miles is australia and austria combined and subtracted by the square miles of luxemburg?
Answer:
2999999 SQ MILES
Explanation:
Square Miles of Australia: 2.968 Million
Square Miles of Austria: 0.032 Million
Add them up and you get 3 Million
Luxemburg Square Miles: 1000
3,000,000 - 1,000
2999000 Square MILES
What is the name of the super continent that was formed during the collision of the North American plate and the African plate
Answer:
Pangea is the name of the supercontinent
cararteristicas principales de los pueblos prehispanicos
Los pueblos prehispánicos están relacionados con las civilizaciones nativas de la América hispánica y anglosajona antes de la llegada de los colonos españoles al continente.
¿Quiénes eran los pueblos prehispánicos?En ella se organizaron civilizaciones como los mayas y los incas, quienes poblaron América antes de la llegada de Colón y el inicio de la colonización del continente. Los mayas, por ejemplo, fueron una civilización que ocupó Centroamérica y México durante mucho tiempo.
La civilización maya se organizó y estructuró de forma descentralizada en ciudades-estado, con lengua propia y religión politeísta. Su economía se basó en la práctica de la agricultura, y obtuvieron desarrollados conocimientos en astronomía, medicina y matemáticas.
Por lo tanto, conocer las civilizaciones prehispánicas y sus características ayuda a comprender los aportes realizados por estos pueblos en diferentes áreas de la sociedad americana, como la cultura y la ciencia.
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What is the primary reason why mountains substantially taller than Mt. Everest are unlikely to arise on Earth
One of the main reasons for the fact that is very unlikely for mountains to rise taller than the Mount Everest on Earth is because, mountains give way under their own weight because of the high geothermal gradient in the crust.
The geothermal gradient, which is unchanged from the paleo-geothermal gradient, is the rate of increase in temperature per unit depth in the Earth's interior caused by the core heat flow.In much of the world, it is approximately 25 °C every mile of depth (1 °F per 70 feet of depth) outside of tectonic plate borders.At oceanic spreading centers (mid-ocean ridges) or island arcs where magma is near to the surface, the largest gradients—40–80 K km1—are measured. The subduction zones, where cold lithosphere sinks into the mantle, have the lowest gradients. Old stable continental crust has a gradient of 20–30 K km1.From the above, it is clear why mountains taller than the Mount Everest, are unlikely to arise on Earth.
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