C The balance between loss of sand blown away to make sand dunes and gain of

C the balance between loss of sand blown away to make

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C., The balance between loss of sand blown away to make sand dunes, and gain of quartz sand from weathering of the granite bluffs just behind the beach.D., The balance between net transport of sand to the beach by wintertime storms, and removal of sand from the beach by smaller summertime waves.E., The balance between sand supply from rivers or from coastal erosion, and sand loss to deep water.On average, beaches lose sand to deep water, and will shrink unless that sand is replaced. Glaciers contributed some of the sand in places, but are not important now for typical beaches. Wind matters a bit, but not too much. Only a little sand is supplied from weathering of the bluffs behind a beach (if the beach has bluffs…); most is brought in from elsewhere. Winter waves tend to remove sand from the beach, with summer waves returning the sand. And while any parent can comment eloquently on the volume of sand brought home by the offspring, the amount is not large in the grand scheme of things.
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Points Earned:, 1/1Correct Answer:, EYour Response:, E4., If you watched a sand grain moved by waves on a beach on the U.S. east coast, you would usually see that most of its motion:A beach sand grain spends most of its time coming in, going out, coming in, going out, and not getting anywhere. A tiny bias exists, such that the in and out will move slightly along the coast, and will cause seasonal changes.Points Earned:, 1/1Correct Answer:, BYour Response:, B5., The above Landsat image from NASA shows Cape Cod, Massachusetts. This is a pile of sand and gravel out in the north Atlantic.  The Cape has no large rivers, and is not especially close to any large rivers (the Connecticut and the Hudson are far out of the picture to the left). Looking along the far right-hand side of the Cape, the long white line is sand of the great outer beach (pink arrow), and sand deposits are prominent to the north and south (yellow arrows). 
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What is going on?beaches. 
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  • Fall '08
  • Erosion, Correct Answer, Cape Cod, Cape

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