Continental Drift and Seafloor Spreading

The presence of mesosaurus fossils in S. America and Africa is evidence of continental drift because (Pick 2)

• the fossils were found all over the globe back then.

• the fossils are found in areas that match up when the continents are moved back to their positions in Pangaea.

• it could not possibly have swam across the Atlantic Ocean.

• the fossils are hard to find

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Who came up with the theory of seafloor spreading?

• Harry Hess

• Alfred Wegener

• Rachel Carson

• Charles Darwin

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How far do tectonic plates move each year?

• Meters per year

• Centimeters per year

• Kilometers per year

• 10's of meters per year

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This scientist created the first map of the ocean floor

• Marie Tharp

• Alfred Wegener

• Albert Einstein

• Harry Hess

Originally the Continental drift theory was not well received by other scientist. Why?

• There was a competing theory at the time that was more believable.

• There was no data showing the continents ever moved.

• The scientists did not know the force responsible for moving the continents.

• The scientist presenting the data was unreliable.

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How long ago is Pangaea believed to have existed?

• 200-300 million years ago

• 1000-2000 years ago

• 10,000-20,000 years ago

• 20-30 billion years ago

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Which of these points is on a mid-ocean ridge?

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

• Harry Hess
• Galileo
• Alfred Wegener
• Newton

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At the Mid-Ocean Ridges you can find:

• underwater trees and bushes

• deep sea trenches

• the oldest crust

• the newest crust

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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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