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Plate Tectonics
Beginning of essay
The main features of are:
The Earth's surface is covered by a series of crustal plates.
The ocean floors are continually, moving, spreading from the center, sinking at the edges, and being regenerated.
Convection currents beneath the plates move the crustal plates in different directions.
The ....
Middle of essay
....alies
Peridically, the Earth's magnetic field reverses. New rock formed from magma records the orientation of Earth's magnetic field at the time the magma cools. Study of the sea floor with magnometers revealed "stripes" of alternating magnetization parallel to the mid-oceanic ridges. This is evidence for continuous formation of new rock at the ridges. As more rock forms, older rock is pushed farther away from the ridge, producing symmetrical stripes to either side of the ridge. In the diagra.... |
| Number of words: 819 |
Approximate pages: 3 |
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