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Unformatted text preview: Bayley Simmons OCS 1005 Homework #1 February 2, 2010 Chapter 3 3. Seismic activity occurs in spreading centers and subduction zones. Earthquakes, however, are more productive in subduction zones than they are in spreading centers. The friction of tectonic plates as the converge cause the seismic activity. There is also steam and heat which manifests into volcanic activity over the subduction zone. 4. Lithospheric plate movement is caused by gravity. The athenosphere expands, becomes less dense, and rises when it is heated from below. After it rises and reaches the lithosphere it cracks the crust to for Lithospheric plates. These plates are formed on both sides of the spreading center. Theses plates slide off the ridges of the spreading centers and are pulled down into the mantle by their own dense edges. 5. The youngest rocks are found near the mid-oceanic ridge. They are found here because magma come u for the ridge over and over again. The ocean floor expands whenever new rock is formed. The oldest for the ridge over and over again....
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This note was uploaded on 05/30/2010 for the course OCS 1005 taught by Professor Condrey during the Spring '08 term at LSU.
- Spring '08