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Sedimentary rocks are formed by the accumulation and lithification of sediments derived from pre-existing rocks, minerals, or organic material. One of the primary ways to classify sedimentary rocks is based on the size and shape of the grains or clasts that make up the rock. Grain size provides information about the energy of the environment in which the sediment was deposited, while grain shape indicates the degree of transportation and weathering that the sediment has undergone. Based on grain size, sedimentary rocks are broadly divided into three main categories: coarse-grained, medium-grained, and fine-grained rocks. Coarse-grained sedimentary rocks consist of relatively large particles that are visible to the naked eye. These rocks, such as ______ _______ _______ _____ ________ ___ _____.
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