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The Rock Cycles
巖石循環
Many people know what the water cycle is, but how about the rock cycle?
許多人都知道水循環，那巖石循環呢？
Did you know that rocks also have a cycle?
你知道巖石也有循環嗎？
The rock cycle explains how rocks get old, melt and become rocks again.
巖石循環解釋了巖石是怎么老化、熔化并再次成為巖石的。
Yes, the rocks become old, too.
是的，巖石也會老化。
So, what makes rocks get old?
那么，什么使得巖石老化的？
Volcanoes, wind, rain, sunlight and other natural events change rocks.
火山爆發、風、雨、陽光和其他自然事件都會改變巖石。
What is the most important activity for the rock cycle? Volcanic activity.
對巖石循環作用最大的活動是什么？火山爆發。
Without volcanic eruptions, there would be no rock cycle.
沒有火山爆發，就不會有巖石循環。
However, other natural events are also important to change rocks from one type to another type.
但是，其他的自然事件對改變巖石的類型也很重要。
