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Unformatted text preview: theory evolved in the 1960s. It explains unified mechanisms such as igneous, sedimentary and metamorphic rocks, distribution of earthquakes and volcanoes, the origin of continents and ocean basins, the distribution of fossil plants and animals, the genesis and destruction of mountain chains, and continental drift. Lithosphere made of both crust and the upper mantle. It is in motion over the asthenosphere. It bends elastically when loaded. Asthenosphere flows plastically when loaded. 2 types of lithosphere continental ~150 km thick & oceanic ~7 to 100 km thick. Plate Boundaries lithosphere is fragmented into ~20 tectonic plates. Plates move continuously at a rate of 1 to 15 cm/yr. Continental Margins where land meets the ocean. (Margins near plate boundaries are active. Margins far from plate boundaries are passive.) 3 types of plate boundaries divergent, convergent, transformed...
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This note was uploaded on 10/12/2010 for the course GLG 72595 taught by Professor Burt during the Fall '10 term at University of Arizona- Tucson.
- Fall '10