A sudden pulse toward __________ carbon isotopic values in the marine stratigraphic record can indicate an episode of __________.
A) light; increased burial of carbon dioxide
B) light; increased burial of organic carbon
C) heavy; increased burial of organic carbon
D) heavy; increased burial of carbon dioxide
Correct Answer:
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Q11: Photosynthesis requires two things, and they are
A)
Q12: Carboniferous fossil fuels were formed in
A) river
Q13: Chemical weathering processes on land use up
Q14: Oxygen isotopes in bivalve shells show a
Q15: Glaciers are isotopically light, so contraction (melting)
Q17: Decomposers break down tissues by
A) photosynthesis.
B) amino
Q18: Only a small percentage of the sugars
Q19: At low temperatures, organisms incorporate a relatively
Q20: Burial of organic carbon _ the atmospheric
Q21: Earth's carbon 13 reaches reached an all-time
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