The Ratio of ¹⁶O to ¹⁸O in Seawater Over Time

question 11

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.

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