During glaciations, the lighter oxygen-16 has a greater tendency to evaporate from the ocean surface than the heavier oxygen-18 does.
在冰川期，较轻的氧-16比较重的氧-18更容易从海洋表面蒸发。
2
The ratio of oxygen-16 to oxygen-18 found in the calcite of a foraminifer's shell depends on the temperature of the water in which the organism lived.
在有孔虫壳的方解石中发现的氧-16和氧-18的比例取决于该生物生存处的水温。
3
When the air was warm, vapor containing the heavier isotope, oxygen-18, condensed and formed precipitation, in the form of snow, more readily than did vapor containing oxygen-16.