[题目]中国的黄土沉积被称为自然环境变化的一本“历史书 .有地质学家猜想黄土高原地表景观的演变经历过由巨大湖泊到林木茂密到黄土高原的千沟万壑.综合所学知识完成下列各题.[1]根据上述猜想推断黄土高原的地表景观经历过A．风力搬运---风力沉积---固结成土---地壳抬升---流水侵蚀B．流水搬运---流水沉积---� 题目和参考答案——青夏教育精英家教网—

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【题目】中国的黄土沉积被称为自然环境变化的一本“历史书”。有地质学家猜想黄土高原地表景观的演变经历过由巨大湖泊到林木茂密到黄土高原的千沟万壑。综合所学知识完成下列各题。

【1】根据上述猜想推断黄土高原的地表景观经历过

A．风力搬运---风力沉积---固结成土---地壳抬升---流水侵蚀

B．流水搬运---流水沉积---固结成土---地壳抬升---流水侵蚀

C．地壳下陷---流水侵蚀---流水沉积---固结成土---地壳抬升

D．风力侵蚀---地壳下陷---流水侵蚀---流水沉积---固结成土

【2】人们发现在黄土部分分布区出现了泥层中夹杂砾石层的现象，关于其成因推断可信的是

A．某些年份气温升高，冰川搬运砾石沉降

B．某些年份风力强劲，搬运颗粒较大的石块

C．某些年份气候干旱，风化作用使岩石崩解

D．某些年份暴雨季节，山洪携带粗砂石沉降

【答案】

【1】A

【2】D

【解析】

【1】黄土高原地表景观变化先是由风力携带岩石碎屑物质（风力搬运），遇地形阻挡风速降低将细砂、碎屑等物质沉降在湖底，形成深厚的湖底淤泥沉积；后由于重力作用逐渐固结成黄土层；然后地壳抬升，形成黄土高原；再后进一步经过流水侵蚀，形成沟壑纵横地表形态。

【2】黄土沉积是由风力携带细砂等物质长期沉积而成，层理现象明显。而砾石岩层颗粒较大并夹杂在其中，应为在大暴雨的季节，强大的山洪携带大的沙粒堆积而成。

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