GPHY 102 Lecture Notes - Lecture 14: Outer Core, The Crust, Geologic Map
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Gphy102 lecture 14: earth materials and the rock cycle. Earth"s components: earth is stratified into layers, mantle (peach) 2900 km in radius and thickness. Liquid outer core (red: two basic strata. Inner mantle: outer mantle, molten, viscous, crust, very thin (8. 4 km) The crust: varying thickness of crust around globe. Isolines showing thickness of crust: not a uniform thickness, composition also varies (elemenst) Crustal composition: almost have is oxygen, a lot of variation in elements that comprise the crust. Rocks: comprised of mineral assemblages in a solid state, most rocks contain several minerals, many different rock types, general three-type classification: Solidified from minerals in a molten state: molten rock (magma) cools and solidifies below the surface (intrusive rocks) or on the surface (extrusive, more than 700 types, most found at depth. Common igneous rocks: granite, coarse textured, intrusive, gabbro, coarse-textured, intrusive, basalt, fine textured, extrusive, formed from lava of same composition as gabbro.
