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.
在火山爆发与随后的崩塌过程中，火山物质不断积累，它的高度经常发生变化。
Its height often changes when volcanic material accumulates during eruptions and subsequently collapses.
另一种联系可能会涉及到大脑温度的变化和神经递质（传递神经冲动的物质）的释放。
Other links may involve changes in brain temperature and the release of neurotransmitters (substances that transmit nerve impulses.)
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