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SlideshowReport

How Oxygen-16 Becomes More Concentrated in Glacial Ice

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(a) Because O-16 is lighter than O-18, water vapor evaporated from the oceans is slightly enriched in O-16.
Because most of this water eventually finds its way back to the oceans in rain and runoff, however, the ratio of the two isotopes in seawater is largely unaffected.
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