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Mr. Sandman- Rob Holman January 7, 2009

Posted by tkcollier in Enviroment.
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On the East Coast, “the big waves come in from the northeast, and they drive the littoral drift predominantly from north to south,” Dr. Holman said, referring to the longshore movement of sand.

By the time a grain of sand washes up on a beach in Florida, it has been battered by waves for a long time. “The physical action of being continually beaten causes the grains to break down, the angular corners to break off,” he said. “They become more rounded.”

And relatively dense mineral grains, like garnet, have settled out. The result is a row of samples shifting from the relatively dark, coarse grains of the Northeast to the fine white beach sand of the Southeast. Thanks Natalia Collier.

via Scientist at Work – Rob Holman – So Much to Learn About the Oceans From Sand – Biography – NYTimes.com.

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