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【题目】“黄土就像冬季地面积雪那样,以差不多的厚度覆盖在起伏不同的各种地形上。”这说明的问题是( )

A.黄土是流水冲积而来的B.黄土是风带来的

C.黄土是地质演变形成的D.黄土是人为造成的

【答案】B

【解析】

黄土高原是年青的高原.。因为黄土高原上的黄土层是很年青的,如果说青藏高原是内力形成的年青高原。那么,黄土高原则是堆积的年青高原。因为黄土层是更新世时期才堆积起来的土层,并且今天还在进行着。黄土风成说最有力的证据是黄土分布在沙漠和戈壁的下风区.因此,黄土高原正好形成在蒙古高原南缘是最好的证据。北风送土,填山没壑。黄土高原自西北到东南,风势逐渐减弱,加上南方气候湿润加速土质分化,黄土颗粒越来越细。因此说明黄土是风带来的,故选B

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