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Drift and Boundaries

By Erin Smoak
Last updated about 5 years ago
39 Questions
Note from the author:
This one is about Alfred Wegener's theory of continental drift, seafloor spreading, and plate tectonics.

Who first proposed the theory of continental drift?

What year did Wegener publish his book?

What was Wegener's theory called?

What did Wegener's book have in it?

What were Wegner's 3 lines of evidence?

What were 2 of the fossils that Wegener used as part of his evidence?

What 2 places did they find tropical plant fossils that are currently covered in ice?

What did Wegener find in South Africa? (Read the whole page)

What kind of rock was in both North America and Scotland?

What did Wegener name the supercontinent?

What was the main reason that most scientists rejected Wegener's hypothesis?

When was this theory revisited?

What caused scientisit to revisit continental drift?

What did sonar find on the ocean bottom?

All are evidence to support the theory of continental drift EXCEPT

What new technology did scientists use to map the bathymetry of the ocean floor?

Magnetic stripes are ____________ on either side of the mid ocean ridge.

Rocks on the sea-floor that lie in a pattern, show a record of the reversals of

What new technology did scientists use to find changes on either side of the mid-ocean ridge?

Where is the youngest seafloor?

Sea-floor spreads apart at both sides of a _____ as new crust is added.

Drilling samples revealed that rock samples taken farther from a mid-ocean ridge are

What new information led to the expanding earth theory?

When continental plates collide what landform is made?

Which type of plates go under other plates?

What mixes with rock to melt it?

What causes the volcanoes on the ring of fire?

What is the example of a transform fault (where plates slide past each other)?

How long has the earth's surface been shifting?

How many major plates are on Earth?

How hot is the mantle?

Why is part of the mantle solid?

Which layer of the earth is under the most pressure?

What is the temperature-propelled motion in the mantle called?

Where are the 2 extra hot regions of the mantle?

How long does it take for the oldest, coolest parts of the crust to sink back into the mantle?

How fast do plates move?

What was the name of the giant landmass about 250 million years ago?

What is the theory about crust moving called today?