Water is all around us．Water is in the ocean．Water is in the lakes and rivers．Water is in the air．There is more water than land on the earth．All living things must have it．We must have it, too．We cannot live without drinking water．Sometimes, we do not have all the water that we need．The land will dry up without water．Sometimes, there can be too much water in the land．If it rains very, very hard, the rain water will run down the hill．It takes some of the land with it when it runs down the hills．It is called erosion when the water takes the land away．“Erosion”in the passage means ________．A.地震B.雪崩C.侵蚀D.霜冻
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C解析根据前面的句子If it rains very, very hard, the rain water will run down the hills．It takes some of the land with it when it runs down the hills可以推知erosion是一种自然地理现象，即“侵蚀”．