Humic acids are difficult to degrade, and therefore they usually remain in a system for several decades.
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Q40: In the oceans, sulfur exists primarily as
A)
Q41: When carbon is limiting in a system,
Q42: Increasing atmospheric carbon dioxide is
A) increasing sedimentation
Q43: The precipitation of soluble iron ions (Fe²⁺
Q44: Nitrous oxide (N₂O) is a
A) direct product
Q46: Studying the redox cycling of Fe in
Q47: Climate scientists are developing methane hydrates to
Q48: Nitrification and anammox both
A) create nitrogen gas,
Q49: The disposal of garbage or sewage in
Q50: The oxidation of _ occurs both biotically
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