Earth Sciences 2240F/G Study Guide - New Madrid, Missouri, Caving, New York State Route 17
4 Apr 2014
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Unit 2 introduction and plate tectonics: earth"s internal structure. Outer core- hot, liquid, metal (metals and silicates) Mantle -upper most part is cold and brittle. Mantle and upper crust are considered as one (lithosphere) Lithosphere-cold brittle and stuck to the crust, top layer. Asthenosphere-thin layer above with some composition but not as much pressure, Mesosphere- thick zone, very dense rocks, acts as a solid even be fluid. Differentiation- heavy material moving inwards and lighter material moving outwards (gravity: internal heat energy, accretion and impact (learn the kinetic energy equation) Earth grew with more and more material adding = kinetic energy increased and was important with the thermal history. 1000km radius = 1000oc increase (impossible, earth would have melted) Initial impacts then the impact of theia: core formation heat. Theia side swept earth to cause the moon to be created. The iron catastrophe: dissipation of tidal energy. ", but really just heavies to core and light toward surface.
