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:
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Which European plain stretches
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C. the Western European plains
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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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One reason that Catastrophism was popular was:
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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.
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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.
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Answer:
True
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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
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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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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.
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2. Why we reduce a map?
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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.
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Answer:
The age of rocks and mountains on the edge of neighboring continents varies.
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Paint and Cool Whip are both examples of colloids. Option B is the correct answer.
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Answer:
i think the answer is "clay or mud mortar"
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PUSH MO LANG YAN MARS
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Answer:
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Answer
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nursery rhymes
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Answer:its human i think
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Draw an arrow showing the direction of the longshore current..
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Answer:
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Most scientists and historians believe that Native Americans first came to North America ___.
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on 4th jan 2012
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A.
“Location” and “Region”
B.
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A
B
C
D
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Answer:
D
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Answer:
Mexico City
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5.
6 HK L M N O
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1
-2 -1
0
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] a) 3
C) 5
] b) 4
d) 6
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Answer:
3/a is the orrect answer
Explanation: