Biogeochemical cycle

Definition

Biogeochemical cycles are the pathways by which elements circulate through ecosystems, involving biological, geological, and chemical processes. These cycles ensure the continuous movement and recycling of essential nutrients in the environment.

5 Must Know Facts For Your Next Test

1. The water cycle is a key biogeochemical cycle involving evaporation, condensation, precipitation, and collection.
2. Carbon cycles through photosynthesis and respiration, playing a crucial role in regulating Earth's climate.
3. Nitrogen fixation by bacteria converts atmospheric nitrogen into forms usable by plants.
4. Phosphorus does not have a gaseous phase and primarily cycles through rocks, soil, water, and living organisms.
5. Human activities like burning fossil fuels and deforestation significantly impact biogeochemical cycles.

Review Questions

• What roles do bacteria play in the nitrogen cycle?
• How does carbon cycling help regulate Earth’s climate?
• Why is phosphorus unique among biogeochemical cycles?

Related terms

Hydrologic Cycle: The continuous movement of water on, above, and below the surface of Earth.

Photosynthesis: The process by which green plants use sunlight to synthesize foods from carbon dioxide and water.

Nitrogen Fixation: The conversion of atmospheric nitrogen into forms that can be absorbed by plants.