Marine organisms absorb calcium and carbonate ions from seawater and convert them into ____________________ in shells and other hard body parts.
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Q12: Carbon exists in the atmosphere mostly as
Q13: When fossil fuels burn, carbon is released
Q14: _ in younger layers of sediment shows
Q16: The past 10,000 years, during which civilization
Q18: The thawing of permafrost can release the
Q19: Tree rings _ during unfavorable years.
A) record
Q20: Methane gas is stored in sea-floor sediments
Q21: The 20 hottest years on record have
Q22: The four industrial greenhouse gases are _.
A)
Q43: _ is the most abundant greenhouse gas.
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