Unit 06 Review Questions

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. The most abundant gas in the atmosphere by both number of molecules and relative mass is:

nitrogen correct incorrect

oxygen correct incorrect

water vapor correct incorrect

argon correct incorrect

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. On average over the last 500 million years in the atmosphere:

carbon dioxide levels have increased and oxygen levels have decreased correct incorrect

carbon dioxide levels have decreased and oxygen levels have increased correct incorrect

both carbon dioxide levels and oxygen levels have decreased correct incorrect

both carbon dioxide levels and oxygen levels have increased correct incorrect

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. This gas has both a relatively high molecular weight and no biological or chemical interactions, and therefore has a nearly infinite residence time in the atmosphere:

oxygen correct incorrect

methane correct incorrect

ozone correct incorrect

argon correct incorrect

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. Ozone absorption of ultraviolet light is most pronounced in the:

lower troposphere correct incorrect

upper troposphere correct incorrect

stratosphere correct incorrect

mesosphere correct incorrect

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. Atmospheric oxygen in the atmosphere comes primarily from:

capture from outer space correct incorrect

splitting of water molecules correct incorrect

breakdown of ozone correct incorrect

photosynthesis correct incorrect

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. Atmospheric carbon dioxide concentrations tend to be highest over:

the Northern Hemisphere correct incorrect

the Southern Hemisphere correct incorrect

the Pacific Ocean correct incorrect

Antarctica correct incorrect

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. The ozone hole is caused primarily by:

increased ultraviolet light levels in the atmosphere correct incorrect

increased mixing of the troposphere with the stratosphere correct incorrect

human-made chemicals released into the atmosphere correct incorrect

climate changed induced by higher carbon dioxide levels correct incorrect