Biogeochemical Cycle Review

The repeated movement of water between Earth’s surface and the atmosphere is called

• the water cycle.
• the condensation cycle.
• precipitation.
• evaporation.

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What is happening to water at D in Figure 3–3?

• Water is falling to the ground as precipitation.

• Water is evaporating from the ocean.

• Water is being taken up by plants through transpiration.

• Water is seeping into the ground to become groundwater.

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Nitrogen fixation is carried out primarily by

• humans.
• plants.
• bacteria.
• consumers.

Organisms need nutrients in order to

• utilize hydrogen and oxygen.
• carry out essential life functions.
• recycle chemical compounds.
• carry out nitrogen fixation.

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The water cycle, carbon cycle, nitrogen cycle, and phosphorus cycles are all examples of

• Biochemical Cycles

• Biogeochemical Cycles

• Chemical Cycles

• Biological Cycles

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What is the most abundant gas in the atmosphere?

• Nitrogen

• Oxygen

• Helium

• Carbon Dioxide

What is one way that carbon can be removed from the atmosphere?

• combustion

• cellular respiration

• photosynthesis

• decomposition

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What happens in nitrification or nitrogen fixation?

• Nitrogen in the soil is broken down and released into the atmosphere.

• Nitrogen in the atmosphere is converted to a usable form in the soil.

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What happens in denitrification?

• Nitrogen in the soil is broken down and released into the atmosphere.

• Nitrogen in the atmosphere is converted to a usable form in the soil.

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Identify the cycle pictured.

• water cycle
• carbon cycle
• nitrogen cycle
• phosphorus cycle

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