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    【题目】地震波在不同媒介中的传播速度是不同的，科学家利用这一原理探究地球内部结构。据此回答下列小题。

    【1】地震波在地球内部传播时，科学家们发现在距离地面大约2900千米深度处横波速度突然降低为零，纵波速度也突然降低，这说明了

    A．地球内部存在着岩浆

    B．该深度上下层次的温度变化明显

    C．大陆地壳与大洋地壳的厚度不同

    D．该深度上下层次的物质组成存在很大差异

    【2】人们在生产活动中还常利用地震波

    A．传递声音信号

    B．进行地质探矿

    C．调查农作物病虫害情况

    D．测量山峰的高度

    【答案】

    【1】D

    【2】B

    【解析】

    试题分析：

    【1】地震波有纵波和横波之分。纵波的传播速度较快，可以通过固体、液体和气体传播；横波的传播速度较慢，只能通过固体传播；距离地面大约2900千米深度处横波速度突然降低为零，纵波速度也突然降低，这说明了该深度上下层次的物质组成存在很大差异，D正确。

    【2】人们在生产活动还常利用地震波进行地质探矿，B正确。

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