Climate Reconstructions Using Oxygen Isotopes (^{18O)over Two Timescales}

question 91

Multiple Choice

Climate reconstructions using oxygen isotopes (^{18O) over two timescales}

Over the span of 70 million years,the Earth's climate

• A)was much warmer 70 m.y.a.compared to the present.
• B)was warmest approximately 10 million years ago and coolest about 56 million years ago.
• C)has remained fairly constant,only showing a warming trend during the past 200 years.
• D)was much cooler 70 m.y.a.compared to the present.
• E)did not fluctuate greatly from approximately 500 m.y.a.to 65 m.y.a. ,then widely fluctuated until the current stable period.

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