The Ratio of Oxygen-16 and Oxygen-18 Isotopes in Plankton Fossils

question 45

Multiple Choice

The ratio of oxygen-16 and oxygen-18 isotopes in plankton fossils in deep-sea sediments can be used to determine ________.

• A) past carbon dioxide concentrations
• B) past temperatures
• C) the age of the fossils
• D) water depth

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