Download What evidence supports plate tectonics (at least 4)?

ES Test Review Plate Tectonics Feb 14 with answers
Friday, February 10, 2017
8:19 AM
1. What evidence supports plate tectonics (at least 4)? Rocks, fossils, continents fit
like puzzle Which type of evidence did Alfred Wege ner NOT use? Why?
Paleomagnetism because not found cold war
https://youtu.be/WhiF6IqGACo
2. What did detailed mapping of the ocean floors reveal? There is a giant
ridge/mountain in the middle of the ocean AND there are deep trenches/valleys
right near the continents
3. What does paleomagnetism data in rocks tell us? Plates move and new crust has
been created. Tells about the magnetics when what rock was formed.
4. What happens when the magnetic field of the earth is reversed? The magnetic
parts of the lava line up with the new poles and nothing else crazy or silly like we
talked about in class
5. Where does molten rock rise up along the sea floor? Mid ocean ridge
6. What does seafloor spreading mean?ocean plates are stretched apart and the
seafloor gets bigger
7. Where is the seafloor youngest?at mid ocean ridge
8. Where is the seafloor oldest? Near the continents far from mid ocean ridge
9. What are the three types of plate boundaries? Answer below
10. At the three types of boundaries is crust created, destroyed, or neither? Answer
below
11. What are the forces at the three types of plate boundaries? Answer below
Type of boundary What happens to crust
force
Convergent
created
compression
Divergent
destroyed
tension
Transform
Slides past neither created nor destroyed shear
12. What type of boundary is the San Andreas Fault? Transform.
13. Are mountains, volcanoes, or trenches formed at convergent boundaries? Explain
your answer.all of them! Remember the lab?
14. What are the two types of convergent boundaries? Continent-continent and
oceanic-continent
15. What is convection in the Earth's mantle? Hot magma rises because it has a
smaller density and the it gets close to the surface where it cools. When it cools
then it is has a higher density and sinks back down again.
16. If seafloor spreading creates new lithosphere does the size of the earth change?
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16. If seafloor spreading creates new lithosphere does the size of the earth change?
No because at trenches plates are subducting and the lithospheric crust is being
melted again in a recycling process
17. What is subduction? one plate goes under another
18. What kind of crust subducts and why? One with largest density which is an
oceanic plate
19. When hotspot volcanoes are formed does the hotspot move or the plate? How
does the movement relate to the age of the volcanoes? Plate is moving AWAY
from the youngest volcano
20. What is the role of temperature in the process of convection? Use the words
high temp, low temp, high density, low density, rise, fall
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