sedimentary rocks lesson EDCI3125

sedimentary rocks lesson EDCI3125 - Sedimentary Rocks

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Sedimentary Rocks For thousands, even millions of years, little pieces of our earth have been eroded --broken down and worn away by wind and water. These little bits of our earth are washed downstream where they settle to the bottom of the rivers, lakes, and oceans. Layer after layer of eroded earth is deposited on top of each. These layers are pressed down more and more through time, until the bottom layers slowly turn into rock.
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Sediments can harden into sedimentary rock in two ways: Pressure -As layer after layer of sediments are deposited, the lower layers are pressed together tightly under the weight of the layers above. Cementing -Some sediments are glued together by minerals dissolved in water.
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Major characteristics of Sedimentary rocks: Classified by texture and composition Often contains fossils May react with acid Often has layers, flat or curved Usually composed of pieces cemented or pressed together
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sedimentary rocks lesson EDCI3125 - Sedimentary Rocks

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