EARTH121 Chapter Notes - Chapter 3: Komatiite, Diorite, Rhyolite
2 Sep 2016
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Midterm ch 1 intro rocks and rock cycle, 12 plate tectonics, esl; ch 2 minerals, 5 weathering, 3 igneous rocks, 4 volcanoues. Namaes for felsic, intermediate, magic, and pyroclastic igneous rocks. We can use rocks to predict things for an example, a rock like granite will not be beneath our feet. That is related to it"s cooling process (plutonic, intrusive) How did granite come to the surface: must have eroded and weathered. Lava from the surface: crystals form as a result from the temperature. Fine texture because crystals have no time to form as they are exposed to cooling at the surface. More durable than sedimentary, often a building stone. Igneous rocks only have 25% of surface exposure, but they have ~90% volume in earth"s crust. Igneous rocks make up the majority of the crust and mantle of the earth. If you have a magma and you cool it down, bowen realized that certain minerals come out at certain temperatures.
