sci 245 study notes

Apr 18th, 2015
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Sedimentary rocks are one of the most common rock types on the Earth s surface, and themost widespread across the globe. What are sedimentary rocks, and how are they formed?Sedimentary rocks are formed from pre- existing rocks or pieces of once livingorganisms. Sedimentary rocks are formed from deposits that have accumulated on Earth ssurface. These rocks often have distinctive layering or bedding. The exogenic weatheringprocess and erosion create raw materials for rocks. When Earth s materials are loosened theymove from higher to lower elevations, wind, water, ice, and gravity move, transport, and depositthese smaller pieces of rock that have broken off bigger rocks. Streams and rivers transport thesesedimentary rocks to lakes, or oceans, or deposit it to nearby floodplains where it accumulatesthere as well. There are three types of rock groups, clastic, biologic, chemical.Clastic Sedimentary RocksWhat is a clastic sedimentary rock? Particles of pre existing rock and minerals make upclastic rock. These particles may have originally been from igneous rocks, metamorphic rocks,or even other sedimentary rocks. Clastic rocks deposited under the influence of some type ofcu

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