5.7: Plate Tectonics- Challenge 1

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1. Historically, ___ covered most of the earth, but today they form only on land and near the poles.: glaciers

2. ___ of prehistoric organisms have been found on widely separated continents, suggesting that these organisms once lived in the same regions or could travel between them easily.: Fossils

3. The Theory of Continental Drift states that ___.: the earth's crust consists of several different continental plates that are constantly moving.

4. Scientists rejected Wegener's theory, because ___.: no plausible mechanism to explain continental movement was known

5. Alfred Wegener died in ___ on an expedition to ___.: 1930; the Greenland icecap

6. Magnetic crystals in older rocks of the same age on the same continent point to ___.: the same point, but not the current magnetic pole

7. What line of evidence made scientists realize that Wegener was right about continental drift?: Apparent polar wander

8. ___ crystallizes from fluid lava and points to the north magnetic pole as the lava cools.: Magnetite

9. Flat-topped mountains in the ocean are known as ___.: guyots

10. Who proposed the theory of seafloor spreading in the early 1960s?: Harry Hess