题目内容

【题目】据新华社电：2011年日本大地震后，富士山等13座活火山活动加剧，应密切关注。据此回答下面小题。

【1】火山口喷出的大量岩浆可能来源于（ ）

A. 岩石圈 B. 上地幔 C. 地核 D. 下地幔

【2】地面发生震动时，日本附近海域上人们的感觉是（ ）

A. 先上下颠簸，后左右摇晃 B. 先左右摇晃，后上下颠簸

C. 只有左右摇晃 D. 只有上下颠簸

【3】下列地区中，地壳厚度最大的是（ ）

A. 青藏高原 B. 东北平原 C. 塔里木盆地 D. 四川盆地

【答案】

【1】B

【2】D

【3】A

【解析】试题分析：

【1】此火山口喷出的大量岩浆可能来源于上地幔顶部的软流层，B对。岩石圈是固态，不是岩浆的源地，A错。地核距离太远，与地壳之间隔着地幔，且下地幔是固态物质，C、D错。

【2】地面发生震动时，因为地震波的横波不能在液体中传播，日本附近海域上人们的感觉是只有上下颠簸，没有左右摇晃，D对。A、B、C错。

【3】地壳厚度受地表形态影响，地表的地形区海拔越高，地壳的厚度越大，最大的是青藏高原，A对。东北平原、塔里木盆地、四川盆地海拔较低，地壳厚度较小，B、C、D错。

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