GEO 110 Lecture Notes - Lecture 11: Silicate Minerals, Oceanic Crust, Outer Core
4 Feb 2020
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Document Summary
Endogenic processes (internal): volcanic and tectonic activity that brings fresh. Exogenic processes (external): forces such as weathering by wind and water rocks to earth"s surface that work the earths surface. The planet has a central core with several layers, or shells, s urrounding it. The densest matter is at the center , and each layer above it is increasingly less dense. Earths interior: crust, mantle, liquid outer core, solid inner core. The lithosphere is the solid, brittle outermost layer of the earth. Includes the crust and the cooler, brittle upper part of the mantle. Earths materials and the cycle of rock change. Asthenosphere , which lies below the lithosphere, is plastic (modlable) Most abundant elements in the earth"s crust are: oxygen, silicon, aluminum, etc. Rocks are composed of minerals - naturally occurring inorganic substances. Form when molten rock cools, forming silicate mineral crystals. Extrusive igneous rocks cool rapidly on the land surface or ocean bottom and show microscopic crystals.
