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Plate Tectonics
Part 1 of Paper
....n 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 source of heat driving the convection currents is radioactivity deep in the Earths mantle.
Advances in sonic depth rec.... Part 2 of Paper
....ces is more than 2000 meters deep. Research into the heat flow from the ocean floor during the early 1960s revealed that the greatest heat flow was centered at the crests of these mid-oceanic ridges. Seismic studies show that the mid-oceanic ridges experience an elevated number of earthquakes. All these observations indicate intense geological activity at the mid-oceanic ridges.
Geomagnetic Anomalies
Peridically, the Earth's magnetic field reverses. New rock formed from magma records the or.... |
| Number of words: 819 - Approximate pages: 3 |
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