Transcript Rock - EDHSGreenSea.net

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