Continental Drift and Seafloor Spreading Quiz

Who is the person credited with developing the theory of continental drift?

• Harry Hess
• Galileo
• Alfred Wegener
• Newton

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This is a picture of glacier scars found in Africa.  What are these evidence for?

• Africa has always been near the equator
• Africa was once in an area of the Earth that had a very cold climate
• The continents have not moved
• sea floor spreading

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What does the theory of continental drift state?

• The continents were once joined in a super-continent and have moved over time
• Continents are stationary and do not move
• The Earth is broken into lithospheric plates that move due to convection currents
• none of the above

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What is this a picture of?

• plate tectonics
• continental drift
• pangea
• glacier scaring

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The Appalachian Mountains in the U.S. match up with a similar mountain ranges in northern Europe. How does this support Wegener's theory of Continental Drift?

• The mountains were formed after tectonic plates had moved away from each other

• The similarities provide evidence North America & Europe were connected when the mountains formed.

• Similar rock samples were found on the ocean floor and at the two mountain ranges indicating that they both formed around the same time.

• This evidence does not support the theory of continental drift.

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Where would the oldest rock be found?

• L
• M
• N
• O

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How is it possible for new crust to be formed without increasing the surface area of the Earth?

• Crust is recycled in subduction zones at the same time it is created at mid-ocean ridges

• New crust is underwater where it sinks

• New crust breaks more easily than old crust

• The oldest crust just breaks apart as the plates move

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The average density of continental crust is 2.8 g/cm³ and the average density of oceanic crusts is 3.2 g/cm³. If these two plates came together, what would happen?

• The two plates would push apart and form a rift zone.

• The oceanic plate would rise up over the continental plate.

• The oceanic plate would sink under the continental plate.

• The two plates would meet head on and rise up to form mountains.

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The OLDEST seafloor is located

• closest to the mid-ocean ridge.

• farthest from the mid-ocean ridge.

• east of Hawaii

• west of California

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Seafloor spreading...

• creates new oceanic crust

• destroys or recycles crust

• creates new continental crust

• creates old crust

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