Unformatted text preview: Crust rocks and soil The rocks and material of the crust are of four types: sedimentary igneous metamorphic magma Metamorphic rocks (e.g. slMetamorphic rocks (e.g. slate) are usually found deep inside mountains, and not too often at the surface. Most common rocks are igneous, and much of the surface is sedimentary. Sediments are: Clastic (consisting of broken up pieces) in order of decreasing particle size: gravel, sand (sandstone), silt and clay (silt and clay constituing shales ). Non-Clastic - mainly chemical deposits - salt, gypsum and coal for example. By biological deposition, e.g. limestone CaCO 3 and dolostone CaMg(CO 3 ) 2 These sediments are sometimes modified by pressure and temperature to become metamorphic rocks with different characteristics - e.g marble is limestone or dolostone after high T,p....
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- Fall '10
- Astronomy, 109 years, 107 years, Crust rocks, e.g. slMetamorphic rocks, 103years