【題目】“黃土就像冬季地面積雪那樣,以差不多的厚度覆蓋在起伏不同的各種地形上。”這說明的問題是( )

A.黃土是流水沖積而來的B.黃土是風帶來的

C.黃土是地質(zhì)演變形成的D.黃土是人為造成的

【答案】B

【解析】

黃土高原是年青的高原.。因為黃土高原上的黃土層是很年青的,如果說青藏高原是內(nèi)力形成的年青高原。那么,黃土高原則是堆積的年青高原。因為黃土層是更新世時期才堆積起來的土層,并且今天還在進行著。黃土風成說最有力的證據(jù)是黃土分布在沙漠和戈壁的下風區(qū).因此,黃土高原正好形成在蒙古高原南緣是最好的證據(jù)。北風送土,填山?jīng)]壑。黃土高原自西北到東南,風勢逐漸減弱,加上南方氣候濕潤加速土質(zhì)分化,黃土顆粒越來越細。因此說明黃土是風帶來的,故選B。

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