The contraction theory implied that Earth's features formed through the process of
What data did Wegener use to prove that the continents had once been joined together?
Although Wegener proposed his continental drift theory in 1915, it was not widely accepted until the 1960s. Why not?
Who proposed the theory of seafloor spreading based on maps of the ocean floor?
Why was the mapping of the ocean floor such an important step in the development of plate tectonic theory?
Earth's magnetic field is constant.
Which feature on the ocean floor caused Hess to suggest the presence of subduction zones?
When did the Pangaean supercontinent begin to break up?
Vine and Matthews are considered to have discovered the final proof for seafloor spreading. What were they able to show based on magnetic bands?
Plate tectonic theory fundamentally altered how geologists view the earth. The biggest difference in the new theory was that Earth
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