Each year, new seafloor is added at the Mid-Atlantic Ridge. The Atlantic Ocean widens, causing North and South America to move farther away from Europe and Africa. Close to the ridge, rocks are younger. As you move away from the ridge, the rocks become older.
The rate of seafloor spreading has not been the same over time. In this activity, you will calculate the average rate of seafloor spreading and then determine when the seafloor started to spread.
1. Where would you find the oldest sections of seafloor, near the continents or near the Mid-Atlantic Ridge?
Working with Map Scales
Below is a map of a section of the North Atlantic. You can see the coastlines of North America and Africa. On both sides of the Mid-Atlantic Ridge, strips of seafloor are labeled with their ages in millions of years. Note the map scale.
2. What is the scale of the map? For this activity, you will use centimeters.
cm = km
3. Choose one strip of seafloor rock. What is the age of the rock?
4. Use your ruler to measure the distance of the strip from the Mid-Atlantic Ridge.
cm
5. Using the calculator, multiply the answer to #4 by 405 to figure out its distance in kilometers. Round to the nearest whole number.
km
Determining Rate of Spreading
Use the age of the rock you have chosen and its distance from the Mid-Atlantic Ridge to calculate seafloor spreading.
6. First you will find out how fast the seafloor is moving away from the ridge on one side. Use a calculator to divide the answer to #5 by the answer to #3. Round to the nearest whole number.
#5 km ÷ #3 million years = km/million years
7. Now find out how fast the seafloor widens every 1 million years. Multiply the answer you got in #6 by 2.
The seafloor spreads at a rate of km every 1 million years.
When Did the Seafloor Start Spreading?
The distance between Point A and Point B, or the coasts of Africa and North America, is 4,550 km. Using your answer to #7, find out when the Atlantic Ocean began to open. Divide 4,550 km by your answer in #7 to find out.
8. 4,550 km ÷ #7 = million years ago.
9. Look at the Geologic Timeline. During what geologic period did the Atlantic start to open?
See if you can figure out the rate of floor spreading (in cm/year) between North America and Africa.
10. #7 x 1000 m x 100 cm ÷ 1,000,000 years = cm/year
11. How far, in centimeters, has the distance between North America and Africa increased since you were born? Multiply the rate by your age.
cm
12. How much has the distance increased during the average lifetime of 82 years?
cm
13. How much closer were the continents when Columbus crossed the Atlantic in 1492?
cm
Answers
Mid atlantic rangeAnswer:
Explanits older
Answer:
F,JKVFJKGNJNDHGTGU8T8UTUI
Explanation:
Related Questions
Which two essential elements of geography are missing from the image above?
A.
“Location” and “Region”
B.
“Movement” and “Places”
C.
“Humans and the environment” and “Movement”
D.
“Places and regions” and “Human systems”
Please select the best answer from the choices provided
A
B
C
D
Answers
Answer:
D
Explanation:
They're are six elements of geography the world in spatial terms etc.
900 kg
2,78 mis
find kinetic energy
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True or False: Africa has inactive volcanoes?
Answers
HELPPPPPPPPPPPPPPP ppp
Answers
Answer:
Human
Explanation:
Answer:its human i think
Explanation:
Citizens propose laws and policies and then
Answers
**THIS IS FOR AMERICA, IM UNAWARE ABOUT OTHER COUNTRIES**
Which phrase best describes information technology
systems that store and send content
systems that create and modify content
systems that replace and delete content
systems that use content for business
what information is available using the geographic information system
how long it takes to get from one location to another
information on plant growth in a specific location
the history of a specific location
laws related to a specific location
Answers
The phrase that best describes information technology among the listed options is that It is a system that store and send content.
Information Technology or otherwise called, IT can be said to mean the study or otherwise of systems which stores or at other times, sends information.
Geographic Information System or GIS as it is popularly called is a system used to check, capture or store data with respect to a particular position or place on earth surface.
From the above definitions, we can conclude that for question 1, systems that store and send content is the answer, and for 2, laws related to a specific location is the answer.
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Durante esta Edad, la ciudad era paisaje rural con algunos centros urbanos dispersos, en en el cual tuvo auge el trabajo en el campo.
Answers
Mineralogy/EARTHSCIENCE
Answer the following questions briefly but concisely. Remember to answer in complete sentences
1. What is the importance of mineral exploration?
2. Differentiate surface mining from underground mining.
3. What is milling? Why extracted materials should undergo milling process before refining them?
:please answer them correctly
Answers
Answer:
Explanation:
1-Exploration is an important step in finding minerals so they can be potentially mined. Our demand for minerals is increasing, for example we need more copper to build renewable energy assets such as wind turbines. This demand is helping drive an increase in exploration across the state.
2-In surface mining, the ore is accessed directly from the Earth's surface, and contact is maintained with the surface throughout the operation. Underground or subsurface mining is accomplished with the help of tunnels going into the Earth, and does not occur on the surface.
3-Milling
food processing
The flour milling process begins with cleaning the grain and tempering it by adding water. The tempered grain is ground in a series of rollermills to remove the bran and to cut the endosperm. Between each rollermill cycle, the ground grain is sifted and separated into various sizes. Middle-size material is sent to a purifier, or shaking sifter, and on to another set of rollermills for further reduction and sifting into a variety of flours and flour blends. These are then stored in large bins.
The flour milling process begins with cleaning the grain and tempering it by adding water. The tempered grain is ground in a series of rollermills to remove the bran and to cut the endosperm. Between each rollermill cycle, the ground grain is sifted and separated into various sizes. Middle-size material is sent to a purifier, or shaking sifter, and on to another set of rollermills for further reduction and sifting into a variety of flours and flour blends. These are then stored in large bins.
Encyclopædia Britannica, Inc.
LEARN ABOUT THIS TOPIC in these articles:
beer
top 20 beer-consuming countriesIn beer: Milling
For efficient extraction with water, malt must be milled. Early milling processes used stones driven manually or by water or animal power, but modern brewing uses mechanically driven roller mills. The design of the mill and the gap between the rolls are important in…
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cereal
wheatIn cereal processing: Milling
Cereal processing is complex. The principal procedure is milling—that is, the grinding of the grain so that it can be easily cooked and rendered into an attractive foodstuff. Cereals usually are not eaten raw, but different kinds of milling (dry and wet) are employed,…
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distilled spirits
The fermentation and distillation process for producing whiskey. The production of whiskey begins with grinding grain into a meal, which is cooked. Malt is introduced to the meal, which results in mash that is cooled and pumped into a fermenter, where yeast is added. The fermented mixture is heated in a still, where the heat vaporizes the alcohol. The alcohol vapours are caught, cooled, condensed, and drawn off as clean, new whiskey. This liquid is stored in a cistern room, and water is added to lower the proof (absolute alcohol content) before the whiskey is placed in new charred oak barrels for aging and later bottling.In distilled spirit: Milling and pressing
The purpose of milling and pressing is to make the starch or sugar more available for enzyme action. Crushing and pressing (grapes and other fruits), milling (cereal grains), or a combination of milling and pressing (sugarcane) are used.
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flour
The flour milling process begins with cleaning the grain and tempering it by adding water. The tempered grain is ground in a series of rollermills to remove the bran and to cut the endosperm. Between each rollermill cycle, the ground grain is sifted and separated into various sizes. Middle-size material is sent to a purifier, or shaking sifter, and on to another set of rollermills for further reduction and sifting into a variety of flours and flour blends. These are then stored in large bins.In flour
… flour, the purpose of the milling process is to separate the endosperm from the other kernel portions. In the production of whole wheat flour, all parts of the kernel are used.
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wheatIn cereal processing: Wheat flour
The milling of wheat into flour for the production of bread, cakes, biscuits, and other edible products is a huge industry. Cereal grains are complex, consisting of many distinctive parts. The objective of milling is separation of the floury edible endosperm from the various branny outer…
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rice
wheatIn cereal processing: Milling
Milling methods used in most of Asia are primitive, but large mills operate in Japan and some other areas. Hulling of the paddy is usually accomplished by pestle and mortar worked by hand, foot, or water power. Improvements are slowly taking place. The yield…
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sugarcane
sugarcaneIn sugar: Juice extraction
…of up to eight four-roll mills, it is forced against a countercurrent of water known as water of maceration or imbibition. Streams of juice extracted from the cane, mixed with maceration water from all mills, are combined into a mixed juice called dilute juice. Juice from the last mill in…
Which European plain stretches
from southeast England to western
France and includes parts of
Denmark, France and Germany?
A. the Northern European plains
B. the Southern European plains
C. the Western European plains
Answers
Answer: The Northern European Plains.
Explanation: I hope this answers your question :)
The European plain that stretches from southeast England to western France and encompassing various parts is called as a Northern European Plain.
Option A is correct.
What is a plain?A plain is referring to land which is usually having no trees and not change much in elevations.
Northern European plains are the most populated areas of the European country stretched from south side of United Kingdom to east side of Russia. It is the region having a suitable climate for cultivating only the seasonal crops.
Therefore, the Option A is correct.
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Examine the following sketch of a shoreline with a series of barriers to trap sand. What would be the direction of the longshore current?
Draw an arrow showing the direction of the longshore current..
Answers
Answer:
From left to right
Explanation:
Earth's history and dating rocks
(3 pts) Name an element that can be used to date back billions of years?
(4 pts) What is the different between relative and absolute dating?
Answers
One of the most widely used is potassium–argon dating (K–Ar dating). Potassium-40 is a radioactive isotope of potassium that decays into argon-40. The half-life of potassium-40 is 1.3 billion years, far longer than that of carbon-14, allowing much older samples to be dated.
absolute dating is based on calculations of the age of rock strata based on half lives of minerals, relative dating is based on the assumed age of fossils found in the strata and the laws of super imposition.
Louisiana
is bordered by Arkansas to the north and Mississippi to the east.
South Carolina is located
of Georgia and south of
.
is located east of the Gulf of Mexico and west of the Atlantic Ocean.
Answers
You dont have any points left .
Answer:
Louisiana
East
North Carolina
Florida
<3
Helpppppppppppppppppp!!
Answers
True or False. The typical tornado lasts a hour or more.
Answers
Answer: False: The longest-lived tornado in history is really unknown, because so many of the long-lived tornadoes reported from the early-mid 1900s and before are believed to be tornado series instead. Most tornadoes last less than 10 minutes.
Explanation:
can i have help for a braniliest to who anwsers first..?
Answers
Answer:
i think the answer is "clay or mud mortar"
Explanation:
hope i helped you :)
PLEASE HELP ME WITH THIS PLEASE I BEG YOU ILL GIVE YOU BRAINLIESTTTTT!! IGNORE THE PEOPLE BELOW ME !!!! AHHHHHHHH
Answers
Answer:
PUSH MO LANG YAN MARS
Explanation:
BWKSJAKBDIAHXI
One reason that Catastrophism was popular was:
Answers
Answer:
Explanation: One reason that Catastrophism was popular was: Ussher’s estimation age of the earth is a huge events to form mountains and canyons.
19. a) Name the type of Joint present in i) Neck ii) Shoulder
Answers
Answer
head shoulder kness in toes
Explanation:
nursery rhymes
On a broken-line graph only the plotted points represent the actual data obtained from an experiment.
TrueFalse??
Answers
Answer:
ture
Explanation:
Name two of the anti-bank laws passed by Julius Caesar
Answers
Answer:
Julius Caesar, in full Gaius Julius Caesar, (born July 12/13, 100? BCE, Rome [Italy]—died March 15, 44 BCE, Rome), celebrated Roman general and statesman, the conqueror of Gaul (58–50 BCE), victor in the civil war of 49–45 BCE, and dictator (46–44 BCE), who was launching a series of political and social reforms when he was assassinated by a group of nobles in the Senate House on the Ides of March.
Explanation:
hope it helps youWhy is it important for a country struggling toward democracy to have more than one political party?
Answers
If only one political party exist for the entire government then the options would be limited in terms of societal development and could lead to dictatorship.
Why are earthquakes on continents most likely to occur above the brittle-plastic transition depth?
Answers
Only a few organisms become extinct each year.
True
False
Answers
Answer:
True
Explanation:
Organisms are very small in size.They can manage with any difficult condition.For which you can find them even inside volcanos.So very few of them extinct each year.Paint and Cool Whip are both examples of which type of mixture?
Solutions
Colloids
Compounds
Suspensions
Answers
Paint and Cool Whip are both examples of colloids. Option B is the correct answer.
Colloids are a type of mixture where particles are dispersed throughout a medium, creating a stable and homogeneous mixture. In colloids, the particles are larger than those in solutions but smaller than those in suspensions. Option B is the correct answer.
Paint is a colloid because it consists of small pigment particles dispersed in a liquid medium, such as oil or water. These particles do not settle over time and the mixture appears uniform. Cool Whip, a whipped dessert topping, is also a colloid. It contains small air bubbles dispersed in a mixture of water, oil, and sweeteners. These air bubbles give Cool Whip its light and fluffy texture.
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5.
6 HK L M N O
What is GI + IM?
1
-2 -1
0
1 2
] a) 3
C) 5
] b) 4
d) 6
Answers
Answer:
3/a is the orrect answer
Explanation:
once criticism of the reducing emissions from deforestation and forest degradation program has been that it
Answers
Which area in Mexico has become both a megacity and a primate city? A. The Tierra fría B. The Mexican Plateau C. The Yucatán Peninsula D. Mexico City
Answers
Answer:
Mexico City
Explanation:
Its a big city, but also a primate ;)
Which of the following evidence supports the theory of plate tectonics?
The age of rocks and mountains on the edge of neighboring continents varies.
Fossils from the same species are found on only one continent.
Iron-rich, molten magma rocks no longer align to Earth’s poles in many locations.
Grooves created from glacier movement travel in opposite directions on each continent.
Answers
Answer:
The age of rocks and mountains on the edge of neighboring continents varies.
Answer:
I believe it is (D) Grooves created from glacier movement travel in opposite directions on each continent.
Explanation:
pls give brainliest if correct
Most scientists and historians believe that Native Americans first came to North America ___.
Answers
Answer:
on 4th jan 2012
Explanation:
2. Why we reduce a map?
Answers
Answer:
Large scale maps are required for urban planning. These provide large space in which detailed information and even the smallest points can be shown. Therefore, at times map is quite big but we have to reduce it according to size of paper and need so that major features may be concentrated upon. Measure the length and width of the map. Divide the length and width by 2 if you are asked to reduce the map to half of its original size. For example, if the length and width of a map are 30cm and 20cm respectively, such a map should measure 15cm by 10cm if reduced to half its size.