Which of the Following Is True of the Concentration of ¹⁸O

question 45

Multiple Choice

Which of the following is true of the concentration of ¹⁸O in seawater?

• A) It is low during glacial periods.
• B) It is high during glacial periods.
• C) It decreases over time as ¹⁸O decays into ¹⁶O.
• D) It increases over time as ¹⁸O accumulates from cosmic sources.

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