Megan Robson, Katy Weaver, Steven Marriott Period 1

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