sometimes blown a bit in wind, sometimes moved stuck to a sandal, some motions over seconds, some slow trends over years. MOST of the motion is: , A., Toward the shore in the summer, and away from the shore in the winter. B., Toward and away from the shore with individual waves. C., Along the shore, in the longshore drift. D., Toward the shore in the winter, and away from the shore in the summer. E., Into deep water. 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, and will move some sand to deep water. , Points Earned:, 0/1 Correct Answer:, B Your Response:, A
, 5., The above Landsat image from NASA shows Cape Cod, Massachusetts. The short yellow arrow indicates new sand deposits, which have formed over the last decades. The long pink arrow indicates underwater sand deposits. The dotted blue arrow points to the great Outer Beach of the Cape. Based on material presented in this class, what is going on? , A., The yellow and pink arrows actually indicate piles of peripherals lost by wintertime nudists sunbathing on the Cape’s beaches. B., The ocean is eroding the blue-arrowed outer beach, and the yellow-arrowed end is growing more slowly, with some sand falling off to the pink-arrowed deposits and then off into deeper water, so the Cape as a whole is shrinking. C., The ocean is eroding the outer beach, but the ocean is also taking sand from the pink-arrowed underwater deposits to add to the yellow-arrowed regions where the Cape is growing. D., The ocean is “mining” material from the pink-arrowed region, and adding that material to the yellow-arrowed and blue-arrowed places, so the Cape is getting longer as well as wider. E., The ocean is eroding the blue-arrowed outer beach, and all of that sand is transferred to the yellow-arrowed end, while nothing happens to the pink-arrowed underwater sand, so the Cape as a whole is holding its own. The blue-arrowed Outer Beach is eroding, losing some sand to the yellow-arrowed Monomoy Island—a remarkable birding spot—and some sand to the pink-arrowed underwater bars, which lose sand to deeper water—the Cape is losing ground. Furthermore, the Cape is losing ground much faster than nudists are losing peripherals.
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