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Continental Drift
Beginning of essay
is the theory that the positions of the earth's continents have changed a lot through geologic time. The German meteorologist Alfred Wegener proposed the first comprehensive theory of in 1912, on the basis of the way the continents fit together on the opposing Atlantic coasts and paleontology co ....
Middle of essay
....ental plates tear apart, drift apart, and collide with each other.
Seafloor Spreading Geophysicists, mapping the ocean floor with an instrument that measures magnetic fields, showed that the rocks on one side of the midocean ridge produced an opposing image geomagnetic pattern of the rocks on the other side. When they dated these rocks, it showed that those nearest the ridge is obviously younger than those farther away are. They came to the conclusion that the midocean ridge is where new ocean .... |
| Number of words: 726 |
Approximate pages: 3 |
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