Biogeochemical Cycles

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What are biogeochemical cycles?

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Biogeochemical cycles are natural processes that recycle nutrients in various chemical forms from the environment to organisms and back to the environment.

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Name the four main biogeochemical cycles.

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The four main biogeochemical cycles are the water cycle, carbon cycle, nitrogen cycle, and phosphorus cycle.

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Which cycle DOESN'T cycle through the atmosphere?

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Phosphorus cycle.

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What is the primary source of carbon in the carbon cycle?

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Fossil fuels (oil, coal, natural gas) and atmospheric carbon dioxide.

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What is denitrification?

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Denitrification is the process by which bacteria convert nitrates (NO3-) into nitrogen gas (N2), returning nitrogen to the atmosphere.

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What is the role of phosphorus in ecosystems?

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Phosphorus is essential for the formation of DNA, RNA, and ATP, and it plays a key role in energy transfer and photosynthesis.

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How does water move through the water cycle?

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Water moves through the water cycle via processes such as evaporation, condensation, precipitation, and infiltration.

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What is nitrogen fixation?

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Nitrogen fixation is the process by which atmospheric nitrogen (N2) is converted into ammonia (NH3) by certain bacteria, making it available for plants.

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What is the significance of the carbon cycle?

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The carbon cycle is crucial for regulating Earth's climate and supporting life by cycling carbon through the atmosphere, biosphere, and geosphere.

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How do plants contribute to the carbon cycle?

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Plants absorb carbon dioxide (CO2) from the atmosphere during photosynthesis, converting it into organic matter.

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