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In page River delta:
"Ancient deltas benefit the economy due to their well-sorted sand and gravel. Sand and gravel are often quarried from these old deltas and used in concrete for highways, buildings, sidewalks, and landscaping. More than 1 billion tons of sand and gravel are produced in the United States alone.[1] Not all sand and gravel quarries are former deltas, but for ones that are, much of the sorting is already done by the power of water.[citation needed]
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