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【题目】下图为某区域等高线地形(单位:米)与地质剖面图,读图完成下列问题。

1

A. 100B. 200C. 199D. 150

2

A. 山谷 B. 背斜

C. 山脊 D. 向斜

3

A. 褶皱弯曲 B. 挤压抬升

C. 流水沉积 D. 外力侵蚀

【答案】

1C

2B

3D

【解析】试题分析:

1】读图根据等高线递变规律,乙地海拔高度为150-200米,甲地海拔为0-50米。计算可知,两地相对高差100<H<200,故选C

2】读图可知,甲处中间岩层向上弯曲,判断为背斜地质构造。故选B

3】根据上题判断,甲处为背斜,一般形成山地地形,但根据等高线弯曲状况,该处形成谷地,是由于该处顶部受张力影响,容易受外力侵蚀,形成谷地。故选D

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