EAR 105 Lecture 10: Earth Science105

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1 Dec 2016
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Topic for exam go up through minerals only. Heat from the geothermal gradient: the rate at which temperature increases with increasing depth. Melting points of minerals generally increases with increasing pressure. Felsic(silicic) rocks ->65% silica by weight, and contain light-colored minerals that are abundant in silica, aluminum, sodium and potassium. The slowly it cools, the bigger the crystals. The faster it cool, the smaller the crystals. Intermediate rocks- silica content between those of mafic and felsic rocks, gray or salt and pepper no point, no k. Diorite andesite (parts of the rock cools very fast) Mafic rock- about 50% silica by weight, contain dark-colored minerals that abundant in iron, magnesium, and calcium. Breaking down rocks by weathering (chemical and physical weathering) Transport of weathered material (erosion, mass wasting, sedimentation) Precipitation of minerals from a water solution. Layering and the types and size of grains in the rocks tell us about how the rocks formed.

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