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sandbar

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sandbar

 or offshore bar

Submerged or partly exposed ridge of sand or coarse sediment that is built by waves offshore from a beach. The swirling turbulence of waves breaking off a beach excavates a trough in the sandy bottom. Some of this sand is carried forward onto the beach and the rest is deposited on the offshore flank of the trough. Sand suspended in the backwash and in rip currents adds to the bar, as does some sand moving shoreward from deeper water. The bar's top is kept below still-water level by the plunge of the waves breaking over it.

sandbar [′san‚bär]
(geology)
A bar or low ridge of sand bordering the shore and built up, or near, to the surface of the water by currents or wave action. Also known as sand reef.
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Tom stirred up the other pirates and they all clattered away with a shout, and in a minute or two were stripped and chasing after and tumbling over each other in the shallow limpid water of the white sandbar.
Tom Sawyer by Twain, Mark View in context
I peeped over the edge of the bank to see the little stream that made the noise; it flowed along perfectly clear over the sand and gravel, cut off from the muddy main current by a long sandbar.
My Antonia by Cather, Willa View in context
A tow- head is a sandbar that has cottonwoods on it as thick as harrow-teeth.
Adventures of Huckleberry Finn by Twain, Mark View in context
 
 
 
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