The land below us is always in motion. Plate tectonics studies these restless effects to give us a better understanding of the Earth and its past. New molten rocks are poured out in the form of magma from the mid-ocean ridges. The rock is recycled and re-entered back into the earth in deep ocean trenches through convection current. The convection current in the mantle drives plates around either against or away from each other. These …showed first 75 words of 2835 total…

…showed last 75 words of 2835 total…p. 96. BIBLIOGRAPHY Bird, John M. and Isacks, Bryan, ed., Plate Tectonics. Washington American Geophysical Union, 1972. Broecker, Wallace S. How to Build a Habitable Planet. Palisades, New York: Eldigio Press, 1985. Christopherson, Robert W. Geosystems. 2nd. ed. New York: MacMillan College Publishing Company, 1994. Erickson, Jon Volcanoes and Earthquakes. Blue Ridge Summit: Tab Books Inc., 1988. Smith, Peter J. The Earth. New York: MacMillan Publishing Company, 1986. Sullivan, Walter Continents in Motion. 2nd. ed. New York: McGraw Hill Book Company, 1992.