vocabulary topography: the landscape of a place precipitation: the process of forming rock from a...
TRANSCRIPT
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Sedimentary Rocks 2
Clastic, Chemical, and Organic
Natural Resources (coal and oil)
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Vocabulary
Topography: The landscape of a place
Precipitation: The process of forming rock from a solution through evaporation
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Clastic Sedimentary Rock
Clastic rock is formed through when fragments of other rocks are deposited, compacted and cemented together.
Clastic rock can take many different forms depending on the size of the fragments (clasts)
Examples of clastic rocks include: Shale, Sandstone, Mudstone, Conglomerate, and
Coal
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The fragments (clasts) can be very small or quite bigSandstone Conglomerate
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Let’s see this in action…
http://www.classzone.com/books/earth_science/terc/content/visualizations/es0605/es0605page01.cfm?chapter_no=visualization
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Chemical Sedimentary Rock
Chemical sedimentary rock forms through the process of PRECIPITATION. A solution such as sea water evaporates and leaves behind the minerals to create a new rock.
Limestone is made from a solution of Calcite that comes from sea shells
Halite (rock salt) is made when highly concentrated salt water
Often, these types of rocks are formed in arid climates where evaporation is most intense
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Some examples…
Halite Limestone
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Organic Sedimentary Rock
Organic sedimentary rock is made from organic matter
Because organic matter can burn, this kind of rock is often used for energy.
Coal is made from dead vegetation in swamps that is compacted over time
Oil is made from dead microorganisms (like algae) that fall to the bottom of the ocean and are compacted over millions of years.
That is why they are called FOSSIL FUELS!!
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Let’s see how coal is made…
http://www.sceyencestudios.com/movies/coalformation.swf
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Coal Mining
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Where is oil found Oil is found in sedimentary rocks that are POROUS
and can soak up the oil.
When geologists are looking for oil, they look for sedimentary rocks like shale that can hold oil.