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为什么科学家能知道岩石的年龄？
科学家能知道岩石的年龄主要是因为使用放射性同位素测年法、分析岩石的形成过程以及对比不同岩石层的年龄，具体原因如下：
1、使用放射性同位素测年法：岩石中含有的放射性同位素会以稳定的速率衰变为其他元素，通过测量岩石中放射性同位素及其衰变产物的比例，可以计算出岩石的年龄。
2、分析岩石的形成过程：不同类型的岩石，如火成岩、沉积岩和变质岩，形成过程不同。通过分析岩石的矿物成分、结构和构造，可以推断其形成环境和过程，从而估计其年龄。
3、对比不同岩石层的年龄：在地质剖面中，不同岩石层按照时间顺序排列。通过对比不同岩石层的放射性同位素年龄和化石内容，可以确定岩石层的相对年龄和绝对年龄。
总结：科学家能知道岩石的年龄主要是因为使用放射性同位素测年法、分析岩石的形成过程以及对比不同岩石层的年龄。
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