The Cycles of Matter Answers

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What percentage of precipitation falls back onto land?

78%

92%

17%

22%

Which of the following statements is true?

The nitrogen cycle is the most important cycle for life.

The oxygen cycle is the least important cycle for life.

Life can be sustained without any of the cycles for life present.

All cycles of matter are equally important for life to be sustained.

Which of the following does not cycle into the atmosphere?

the carbon cycle

the phosphorus cycle

the nitrogen cycle

the oxygen cycle

Which of the following two cycles are the most closely related in their role in sustaining life?

carbon and nitrogen

water and nitrogen

carbon and oxygen

nitrogen and phosphorus

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