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Sedimentary Rocks - Running head ASSIGNMENT SEDIMENTARY...

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Running head: ASSIGNMENT: SEDIMENTARY ROCKS 1 Assignment: Sedimentary Rocks Nikki Vergets Sci/230 7/3/2011 Ted Brewster
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ASSIGNMENT: SEIMENTRY ROCKS 2 Assignment: Sedimentary Rocks The most common rocks on Earth’s surface are sedimentary rocks. These rocks are formed from particles that have been deposited by water, wind, glaciers, or landslides. These particles, or sediments, become compacted or cemented together over time. Sedimentary rocks form at or near the surface of Earth. They usually are easy to recognize because the sediments are deposited in layers. The arrangement of layers is known as stratification. Any rock that contains fossils is almost certainly a sedimentary rock. Fossils are the remains or any other evidence of living organisms, such as plants and animals, preserved in rock. Fossils are found in sedimentary rocks because when an organism dies, it can become buried in loose sediments. Although the soft parts of the organisms decay, the hard parts may become preserved as fossils. For example, the shells of clams and mussels are often found in sandstone, limestone, and shale. Even if the entire organism decays, an impression might be left in the rock.
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