Download Chapter 7-1 and 7-2 Review

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Chapter 7-1 and 7-2: “Plate Tectonics”
Review Guide
DIRECTIONS: Answer the following questions using your reading guides,
notes, and book. You DO NOT have to write in complete sentences.
7-1 Inside the Earth:
1. List the three main layers of the Earth?
a. ____________________________
b. ____________________________
c. ____________________________
2. At what temperature does rock begin to melt?
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3. What is the crust called under the oceans & under the continents?
a. Ocean - _______________________
b. Land - ________________________
4. What is the upper part of the mantle that includes the entire crust
called? (These are the plates that move)
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5.
In what part of the mantle does convection take place?
_________________________________________
6. What is the lower part of the mantle where magma moves very slowly
called?
__________________________________________
7. What are the two parts of the core called?
a. _______________________________
b. _______________________________
8. Which part of the core is solid iron and nickel? ___________________
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7-2 Restless Continents:
9. Alfred Wegener came up with the theory of ____________________ drift.
He believed that the continents were all once joined 245 million years ago
in one single mass called ___________________.
10. What were the 3 kinds of evidence that proved Wegener’s theory?
a. ________________________________________________
b. ________________________________________________
c. ________________________________________________
11. What were the 2 huge continents called when Pangaea split about 180
million years ago?
___________________________
_____________________________
12. Convection currents take place inside the Earth and cause the tectonic
plates above to move. Use the terms in the box below to explain this process.
more dense
less dense
heat
cool
rise
sink
circular motion
contract
expand
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SEA-FLOOR SPREADING:
13. Magma rises up through the __________________________________.
14. The magma hardens and forms new ____________________________.
15. As more magma rises and hardens the ocean floor moves away from the
mid-ocean ridge and becomes ________________________________.
16. The old ocean floor then goes down into the _________________ where it
is _____________________ back into the mantle and melts back to magma.
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Important:
- Study the Earth’s layers diagram and the seafloor spreading diagram in
your notes!!! This will help you label the statements below.
Directions:
- Write the word that best relates to the statement in the blank before it.
- You may use the following terms more than once!
Word Bank
Continental Crust
Oceanic Crust
Inner Core
Lithosphere
Asthenosphere
Crust
Outer Core
Mesosphere
1. _______________________ The liquid Iron & Nickel layer of the Earth.
2. _______________________ The part of the mantle that is known to be like asphalt.
3. _______________________ One of the 3 main layers that is the thinnest.
4. _______________________ Crust that is found under the oceans.
5. _______________________ A layer that holds the crust and upper mantle.
6. _______________________ The layer of the Earth that is over land.
7. _______________________ This layer of the Earth is solid because of the intense
pressure of the other layers above it.
8. _______________________ The plates that move on the Earth are made up of
this layer.
9. _______________________ The layer where convection takes place.
10. _______________________ This layer has molten rock that moves very slowly.
11. Explain how the youngest crust is formed at the mid-ocean ridge and what
happens to the age of the oceanic crust as you go farther and farther away from
the mid-ocean ridge.
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Use the word bank to help you to finish the diagram by writing the
correct term on the appropriate line.
7.
1.
2.
3.
8.
4.
5.
6.
Inner core
Outer core
Mesosphere
Lithosphere
Asthenosphere
Continental crust
Oceanic crust
Convection currents
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