INTRODUCTION Plate tectonics is a recently developed science, and it can be used to explain a lot of phenomena on the Earth, such as earthquakes. There are actually two big fundamental theories of plate tectonics. One of the basic theories is called continental drift, and the other one is the theory of seafloor spreading. The theory of continental drift can not explain the power source of moving continents, so the theory is not complete. The …showed first 75 words of 918 total…

…showed last 75 words of 918 total…tectonics. The Earth shows that it is still functioning by the movements of plates. Works Cited Furlong, Kevin. ¡§Plate Boundary Structure along the San Andreas Fault .¡§ Online posting. 20 May. 2002 < http://www.geodyn.psu.edu/research/americas/sanandreas.html > National Earthquake Information Center. ¡§Earthquakes and Plate Tectonics.¡¨ Online posting. 20 May. 2002 < http://wwwneic.cr.usgs.gov/neis>. W. Jacquelyne Kious, and Robert I. Tilling. This Dynamic Earth: The story of Plate Tectonics. Washington, DC: Accents Pubns Service, 1996.