foraminifera fossil shells containing calcite with high percentages of oxygen-16 were deposited at times when
还是审题没理解题目要问的东西。。
这里说的是o-16高的条件
原文是说O-16低得条件。那么反过来就可以。
During glaciations, the lighter oxygen-16 has a greater tendency to evaporate from the ocean surface than the heavier oxygen-18 does.
![](https://img.haomeiwen.com/i23830106/4e08cdcf196dab90.png)
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