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.
Correct Answer:
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