Continental Drift
Plates
Plate Boundaries I
Plate Boundaries II
Miscellaneous
100
Who developed the theory of continental drift?
Wegener
100
What are the plates made out of?
Rock
100
Two continental plates collide at a convergent boundary - what is formed
Mountains
100
Which plate is thick, which plate is thin and more dense - continental/oceanic
Thick - continental Thin and more dense - oceanic
100
What are the two ways volcanoes can form
Subducting plate / over a hotspot
200
What does the theory of continental drift say about how Earth looked in the past?
The continents were in different locations than they are today
200
True or false - all plates are the same size
False - plates are different sizes
200
Where is the youngest rock found near a mid-ocean ridge?
In the middle, because that's where it is forming
200
Why do we find earthquakes and volcanoes in similar places on Earth?
Because that is where plates are interacting
200
Ocean floor ______________ occurs at divergent boundaries
Spreading
300
What did evidence of continental fit tell Wegener?
That the continents used to be together (Pangaea)
300
What causes plates to move?
They are floating on the moving rock of the mantle
300
An oceanic plate converges with a continental plate - what happens?
The thinner, denser oceanic plate subducts under the thicker continental plate
300
List the three types of plate boundaries shown below ---><--- <------> ---> <---
Convergent Divergent Transform
300
How does magma create a volcano?
It rises to the surface, through the rock above it
400
What fossil evidence did Wegener rely on?
The same fossil was found on several continents, showing they used to be together
400
True or false - there are large gaps between the plates
False - the plates fit closely together
400
What kind of plate boundary produces volcanoes?
Ocean plate subducting under a continental plate
400
What kind of convergent boundary produces mountains but not volcanoes?
Continental collision
400
Why can one hotspot make a line of volcanoes
Because the plate is moving over the hotspot
500
What did the coal Wegener found in Antarctica show?
That tropical plants used to live in Antarctica (so it must have been warmer there)
500
If all the water was drained from the Earth's oceans, what would we see between the continents?
More rock
500
What happens to the rock when two continental plates collide to form mountains - does it break up into pieces, or fold together?
Folds together
500
New rock fills a plate boundary on the ocean floor, pushing the older rock on the plates apart - what is that called?
Sea floor spreading
500
The law of conservation of matter says that new matter is neither ____________ nor _________
Created / destroyed
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