【题目】板块运动表现为两种力:___________和__________。板块在不断运动着,板块内部相对稳定,板块与板块交界地带多易发生火山地震,著名两大火山地震带是_____________、_____________火山地震带。
【答案】张裂 挤压 环太平洋火山地震带 地中海-喜马拉雅
【解析】
地质学家经过长期研究,又提出了板块构造学说.板块构造学说认为,地球岩石圈是由板块拼合而成的;全球主要有六大板块,其中太平洋板块几乎全部是海洋,其余板块既包括大陆,又包括海洋;海洋与陆地的相对位置是不断变化的;板块构造学说,认为一般来说板块内部比较稳定,板块与板块交界地带,地壳比较活跃,多火山、地震。
板块和板块之间运动频繁,但力的方向不同.板块发生张裂运动时,其运动方向相反,板块之间的距离不断扩张,造成断裂陷落,地表会产生裂谷或海洋;板块发生挤压运动时,其方向是相向运动,板块之间的距离缩小,地表还会不断隆起,形成高山、岛弧链或海沟。板块在不断运动着,板块内部相对稳定,板块与板块交界地带多易发生火山地震,世界两大火山地震带是环太平洋火山地震带和地中海-喜马拉雅火山地震带。
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