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Megan Robson, Katy Weaver, Steven Marriott Period 1 Sedimentary Rock • ¾ of rocks in the lithosphere • Three types – Clastic – Organic – Chemical • Heat and pressure exerted on these rocks forms metamorphic rocks Clastic Sedimentary Rocks • Mud, sand , gravel and clay • Made of clasts, which are particles of other rocks • Sediments that clump into rocks Organic Sedimentary Rocks • Forms in the sea as microscopic organisms • Formed by dead plankton • Limestone and chert are created • Dead plant material to peat to coal Chemical Sedimentary Rocks • Isolated sea water that evaporates • Some minerals precipitate • Called evaporite sequence • Rocks are left over Sediments • Small pieces of other rocks • Comes from erosion and weathering of igneous, metamorphic, and sedimentary rocks • Come together to form sedimentary rocks Igneous Rock • Over 2/3 of the Earth’s surface • Made from Magma under the Earth’s crust • Basalt is the most common igneous rock • All rocks started as igneous rocks • In the lithosphere Magma • Under the Earth’s crust • Cools to form igneous rocks • Melted igneous and metamorphic rocks Metamorphic Rock • Found in the lithosphere • Heat and pressure exerted on sedimentary and igneous rocks=metamorphic rocks Bibliography • http://www.windows.ucar.edu/tour/link=/ear th/geology/sed_intro.html • http://geology.about.com/cs/basics_roxmin /a/aa011804b.htm
