Sample of chalk

Sample of chalk

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Credit: TREVOR CLIFFORD PHOTOGRAPHY/SCIENCE PHOTO LIBRARY

Caption: Sample of chalk. Chalk is a soft, white, porous sedimentary rock. Sedimentary rocks are formed by the compaction of water deposits over long periods of time. Chalk is a form of limestone and consists mainly of the mineral calcite from the shells of tiny marine organisms.

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Keywords: 1, calcite, calcium carbonate, chalk, cut out, cut outs, cut-out, cut-outs, cutout, cutouts, earth science, geological, geology, marine, mineralogy, one, porous, rocks, sample, sedimentary rock, single, soft, specimen, still life, still-life, white, white background

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