Multiple Choice
The ratio of 16O to 18O in seawater over time estimated from deep-sea sediment cores indicates
A) an overall warming trend from about 50 million years ago.
B) an overall cooling trend from about 50 million years ago.
C) cycles of cooling and warming around an average of about 5 degrees C.
D) a remarkably steady global temperature, suggesting that continental drift, not climate change, causes most ecological changes.
Correct Answer:
Verified
Correct Answer:
Verified
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