【題目】板塊運動表現(xiàn)為兩種力：___________和__________。板塊在不斷運動著，板塊內(nèi)部相對穩(wěn)定，板塊與板塊交界地帶多易發(fā)生火山地震，著名兩大火山地震帶是_____________、_____________火山地震帶。

【答案】張裂 擠壓 環(huán)太平洋火山地震帶 地中海－喜馬拉雅

【解析】

地質(zhì)學(xué)家經(jīng)過長期研究，又提出了板塊構(gòu)造學(xué)說．板塊構(gòu)造學(xué)說認為，地球巖石圈是由板塊拼合而成的；全球主要有六大板塊，其中太平洋板塊幾乎全部是海洋，其余板塊既包括大陸，又包括海洋；海洋與陸地的相對位置是不斷變化的；板塊構(gòu)造學(xué)說，認為一般來說板塊內(nèi)部比較穩(wěn)定，板塊與板塊交界地帶，地殼比較活躍，多火山、地震。

板塊和板塊之間運動頻繁，但力的方向不同．板塊發(fā)生張裂運動時，其運動方向相反，板塊之間的距離不斷擴張，造成斷裂陷落，地表會產(chǎn)生裂谷或海洋；板塊發(fā)生擠壓運動時，其方向是相向運動，板塊之間的距離縮小，地表還會不斷隆起，形成高山、島弧鏈或海溝。板塊在不斷運動著，板塊內(nèi)部相對穩(wěn)定，板塊與板塊交界地帶多易發(fā)生火山地震，世界兩大火山地震帶是環(huán)太平洋火山地震帶和地中海－喜馬拉雅火山地震帶。

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