ROCKS~SEDIMENTARY ROCKS FORM FROM
EARLIER ROCKS~
Vocabulary SEDIMENTS
Materials that settle out of water or air.
FOSSILSThe remains or
trace of an organism from long ago.
Sedimentary rocks…
Develop when loose material gets pressed/cemented together
sediment
compaction/cementation
sedimentary rock
Mineral “cement”
Conglomerate Limestone
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What can make up sediment?
Loose rock pieces
Loose mineral pieces
Plantpieces
Animalremains
How do sedimentary rocks form?
From of sediment that build up on
OR
Sedimentary rocks from plants??
Coal is made up of plant remains: dead wood, bark, leaves, stems, and roots.
As plants die, they form layers. Then layers of other sediment are buried on top of plant layers, compacting and cementing into coal.
Sedimentary rocks from shells??
Limestone is made up of shells and skeletons of ocean organisms.
When organisms die, the shells and skeletons settle on the ocean floor and make layers. Over time the layers are
buried, pressed, and cemented together, making limestone.
Sedimentary rocks tell us about the past:
Fossils CrossbedsMud Cracks Ripplesof water creatures can tell us that the area wascovered by a lake or ocean long ago.
show that rocks formed where the area was very wet , followed by a dry period.
show water and winddirection and movement
show us the direction sand dunesand sand bars were moving
Which rocks are sedimentary?
Breccia Marble
SandstoneIron Ore Scoria Pegmatite
QuartziteChert
Shale Limestone
Why?
Drag the green ovals over the sedimentary rocks.
Design your own sedimentary rock:
Rocks in the World Around Us
More on the Rock Cycle
ROCK CYCLE TESThttp://www.neok12.com/diagram/Types-of-Rocks-01.htm
Rock Cyclehttp://www.classzone.com/books/earth_science/terc
/content/investigations/es0602/es0602page02.cfm