他们对于一些来自冰川，河床以及珊瑚的岩心进行了分析并对可以随着岩层深度以及时间而变化的指示性化学物质的变化水平进行了测量。
They analysed cores from glaciers, lake bottoms and coral reefs and measured how the levels of some telltale chemicals changed with depth, and thus with time.
这些河床，火山爆发和冰川告诉我们怎么样过去？
What do its river beds, volcanoes and glaciers tell us about its past?
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