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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=/earth/geology/sed_intro.html
• http://geology.about.com/cs/basics_roxmin/a/aa011804b.htm