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Sedimentary Rocks 2. Clastic, Chemical, and Organic Natural Resources (coal and oil). Vocabulary. Topography: The landscape of a place Precipitation: The process of forming rock from a solution through evaporation. Clastic Sedimentary Rock. - PowerPoint PPT Presentation
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Sedimentary Rocks 2
Clastic, Chemical, and Organic
Natural Resources (coal and oil)
Vocabulary Topography: The landscape of a place
Precipitation: The process of forming rock from a solution through evaporation
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
The fragments (clasts) can be very small or quite bigSandstone Conglomerate
Let’s see this in action…
http://www.classzone.com/books/earth_science/terc/content/visualizations/es0605/es0605page01.cfm?chapter_no=visualization
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
Some examples…Halite Limestone
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!!
Let’s see how coal is made…
http://www.sceyencestudios.com/movies/coalformation.swf
Coal Mining
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.