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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