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Our transcription: Geologists use their understanding of sedimentary rock to do more than reconstruct the history of the Earth's surface. Most of the economically valuable resources that are extracted from the Earth's crust come from sedimentary rock. Most people know that sedimentary rocks are the source of fossil fuels, such as oil, natural gas, and coal, but the economic value of sedimentary rock influences almost every part of our lives. For example, virtually all buildings and public structures require sedimentary rock in their construction. The cement and the sand and gravel used to make concrete, iron ore for steel, bauxite used in making aluminum, brick and tile, cut stone used for facing large buildings, and even asphalt for the roads which make these buildings accessible. In fact, almost everywhere you look, you can find examples of the commercial and industrial uses of sedimentary rock.
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