____________________ in younger layers of sediment shows that about 10,500 years ago, pines displaced the spruce, indicating that the temperature became warmer.
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Q9: When carbon dioxide gas dissolves in seawater,
Q10: The concentration of _ in the atmosphere
Q11: Climate change does not follow linear relationships;
Q12: Carbon exists in the atmosphere mostly as
Q13: When fossil fuels burn, carbon is released
Q16: The past 10,000 years, during which civilization
Q17: Marine organisms absorb calcium and carbonate ions
Q18: The thawing of permafrost can release the
Q19: Tree rings _ during unfavorable years.
A) record
Q43: _ is the most abundant greenhouse gas.
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