2-22 - Earth Materials Rocks Rock solid aggregate or...

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Earth Materials 18:29 Rocks Rock   solid aggregate or mixture of minerals Rocks broadly classified by how they form Type of Minerals in a rock are related to where it forms and what it forms from Proportion of Minerals in a specific rock type can vary 3 Rock Categories Igneous – from crystallization of molten rock (magma) Sedimentary – from the compaction and cementing of sediments or  precipitation out of water Metamorphic – transformation of minerals in pre-existing rocks Sedimentary Rocks Sandstone (sand) Siltstone and Shale (clay and mud) Conglomerate (gravel) o Gravel found in areas of fast moving water and erosion Limestone (calcite precipitation, shell deposits) Sedimentary Structures Sedimentary rocks often return features such as ripple marks and mud-cracks Igneous Rocks: Terms Magma – molten silicate rock Intrusive Rock – from magma that crystallizes below the surface
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This note was uploaded on 04/20/2008 for the course GEOL 105 taught by Professor Kohut during the Spring '08 term at University of Delaware.

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2-22 - Earth Materials Rocks Rock solid aggregate or...

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