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Download File - Earth Science With Mrs. Locke
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3 Groups of Rocks There are only 3 groups of rocks, each is determined by how the rock formed All rocks are made from minerals Igneous • formed when melted rocks cool and harden http://topex.ucsd.edu/es10/lectures/lecture10/lecture10.html 2 Types • EXTRUSIVE: • Lava cooling on surface • INTRUSIVE: • Magma cooling in crust (Usually slow) Some common ones are: Obsidian Granite Pumice Diorite Metamorphic • Rocks that are changed by extreme heat and pressure. • Often found near mountains and deep in Earth http://geophysics.ou.edu/geol1114/notes/met_rx/met_rx.html 2 types: Nonfoliated • Random mineral arrangement Foliated • minerals arranged in layers or bands Common Examples: Marble Schist Slate Gneiss quartzite Sedimentary Rock • When broken up pieces of rocks become compacted and cemented together. http://www.glogster.com/media/4/24/53/53/24535304.jp g http://comp.uark.edu/~sboss/vrockbag.htm#sedimentary • Made by weathering, erosion, deposition, compaction, and then cementation Usually found in places that were below water Common Examples • Sandstone • Conglomerate • shale • Limestone The Rock Cycle It is the continual process that changes any type of rock into a different kind of rock. The cycle is very slow and never ending Follow the arrows and 1 rock can turn into any of the other rock types. Heat and pressure Magma Melting Sedimentary Rock Erosion, deposition, compaction, & cementation Cooling Melting Igneous Rock Erosion, deposition, compaction, and cementation Metamorphic Rock
