GEOL 106 Lecture Notes - Inner Core, Continental Crust, Water Cycle
23 Nov 2011
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What causes the stress in the earth: that"s what we need to answer now. So lets look at the dynamic earth system more closely. Structure of the earth: seismic waves have been critical in giving us a picture of the inside of the earth ( an xray of the earth ). The waves are reflected and refracted at boundaries between different materials: waves reveal a layered earth, p and s wave p waves can go through liquid s waves cant determines 3 layers. 2900 km from crust to get to outer core ( depth of mantle) 5100 km from crust to get to core 6371 km to get to centre of earth. Mantle (solid) outer core (liquid) inner (solid) : continental crust in about 30 km thick and oceanic crust in 5 km thick. Increase in fe content and density: cont crust ------ felsic, moho is the boundary between the crust and mantle, moho stands for mohorivicic discontinuity
