Glacial Ice Cores Can Be Used to Determine the Atmospheric

question 44

Multiple Choice

Glacial ice cores can be used to determine the atmospheric concentration of CO₂ during Earth's history.How do scientists come up with these data?

• A)They use the thickness of the ice layers to determine how much CO₂ was in the atmosphere.
• B)The melt the ice and measure how much carbon was trapped in the ice.
• C)They record changes in the shape of ice crystals to determine the paleoclimate.
• D)They break the ice apart,release the air trapped in bubbles,and then measure the gases.

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