EOSC 114 Lecture Notes - Lecture 8: Oceanic Basin, Oceanic Crust, Plate Tectonics
22 Sep 2016
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Document Summary
A key process in the development and ongoing evolution of our planet. 2/3 of the earth"s crust is entirely igneous (oceanic crust). Continental crustal rock is predominantly igneous and metamorphosed igneous rocks. Study the hazards such as: lahar, arise in wet seasons and create mudslide of flame, pyroclastic flow, temperature is too hot that a person could get burnt inside out. There is intrusive and extrusive: either volcanic or extrusive or, plutonic or intrusive. Extrusive rocks are fast cooling and have small crystals. Intrusive rocks are slow cooling and produce large crystals. Volcanoes form where magma and gay leak out from the earth"s crust and mantle. Magma, created by melting pre-existing rock below the earth"s surface, reaches the surface through fractures and extrudes as lava or explodes as pyroclastic material. Magma is under the ground and lava is on the surface. Magma melted rock in the earth, below the earth"s surface. Lava melted rock exposed at the earth"s surface.
