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Describe the nitrogen cycle in today’s atmosphere. Theoretically, what would happen to molecular nitrogen production if nitrification was eliminated the cycle? Hint: Consider the processes during the preoxygen atmosphere.

What is the intensity of radiation emitted by a hot desert (330K) relative to that emitted by the stratosphere over the South Pole during July (190K)? Hint: Find the ratio of the radiation intensities. 09:1 1.73:1 0 3:1 O 1:1

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