4.4 Biogeochemical Cycles

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What is a biogeochemical cycle?

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A biogeochemical cycle is the movement of elements and compounds through living organisms and the physical environment, involving biological, geological, and chemical processes.

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What is the carbon cycle?

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The carbon cycle is the process by which carbon is exchanged among the atmosphere, land, water, and living organisms, including processes like photosynthesis, respiration, and decomposition.

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What human activities impact the carbon cycle?

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Human activities such as burning fossil fuels, deforestation, and industrial processes increase carbon dioxide levels in the atmosphere.

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What is nitrification?

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Nitrification is the process of converting ammonia into nitrates and nitrites, primarily carried out by bacteria in the soil.

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What is denitrification?

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Denitrification is the process by which nitrates are converted back into nitrogen gas, returning nitrogen to the atmosphere.

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What role do plants play in the carbon cycle?

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Plants absorb carbon dioxide from the atmosphere during photosynthesis, helping to reduce atmospheric CO2 levels.

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What is condensation in the water cycle?

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Condensation is the process where water vapor cools and changes into liquid water, forming clouds.

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What is precipitation in the water cycle?

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Precipitation is any form of water, such as rain or snow, that falls from the atmosphere to the Earth's surface.

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What is transpiration?

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Transpiration is the process by which water is absorbed by plants and then released as water vapor into the atmosphere.

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What is the role of decomposers in biogeochemical cycles?

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Decomposers break down dead organic matter, returning nutrients to the soil and making them available for plants.

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