Earth Sciences 1022A/B Chapter Notes - Chapter 7: Continental Crust, Continental Drift, Oceanic Crust
15 Nov 2018
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Document Summary
Similar rocks and fossils on multiple continents. Glossopteris found in southern africa, south america, australia, Mountain belts terminate at one coastline and reappear on a continent across an ocean, suggesting they were once part of one continuous chain (same type of rocks) Evidence that a region had different latitude positions in the past. Rocks in india showed evidence of glaciation and some rocks in. North america showed evidence of a tropical climate. Solid surface of the earth floats above a partially molten core. Plates move at a rate of 2-11 cm/year now but was faster when the plant was hotter. The earth is divided based on composition, physical properties, and behaviour. Boundary marked by a change in composition from the crust to the mantle. This is a hypothesis based on geophysical data. Includes the crust and a thin slice of the upper mantle that cools very rapidly and begins to solidify (behaves rigidly) Rocks flow slowly under stress without melting.
