Oxygen-18 and Oxygen-16 Are Useful in Studying the Geologic Past,including

question 25

Multiple Choice

Oxygen-18 and oxygen-16 are useful in studying the geologic past,including gathering information about past climate,because ____________.

• A)ozone formation and decay depends upon the ratio of oxygen-18 to oxygen-16
• B)both water and calcite contain oxygen
• C)ice and plankton skeletons are often found in layers that geologists can age-date
• D)B and C are both correct.

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