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What are sand and gravel?

gravel Sand
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What are sand and gravel?

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Sand and gravel are defined not by their composition, but by their size. Sand is defined by particles 1/16 to 2 mm in diameter. Gravel is defined by particles greater than 2 mm in diameter. Sand and gravel in Tennessee are composed largely of the mineral quartz – Silicon Dioxide (SiO2).

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