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岩石是怎样形成的?

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岩石是怎样形成的?

地壳chu1于缓慢的运动之中,正是这zhong运动改变着构成地球表面的岩石形态。高山受挤压耸起,又经风化侵蚀,分解成砂砾、碎屑堆积起来,形成其他zhong类的岩石。这些岩石可能会沉入地幔,在高温下熔化。火山pen发时,熔化的岩石以岩浆形式被pen到地面,ye岩冷却凝固后又变成岩石。岩石又会风化、分解,开始了下一个循环周期。岩石有三zhong基本的类型。岩浆岩是由岩浆或熔岩形成的,也称火成岩。沉积岩是由砂砾、碎屑沉积而成。变质岩是由其他类型岩石,在受热和重力的作用下,经受了变质作用而形成的岩石。

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