Biogeochemical Cycles

Biogeochemical cycles are pathways through which essential elements are circulated through the biotic and abiotic components of the Earth. These cycles involve the transfer of elements such as carbon, nitrogen, phosphorus, and water between the atmosphere, lithosphere, hydrosphere, and biosphere.

Carbon Cycle

The carbon cycle is the process through which carbon is exchanged between the atmosphere, oceans, biosphere, and geosphere. It involves processes such as photosynthesis, respiration, decomposition, and combustion.

Nitrogen Cycle

The nitrogen cycle is the movement of nitrogen between the atmosphere, soil, and living organisms. It includes processes such as nitrogen fixation, nitrification, assimilation, and denitrification.

Phosphorus Cycle

The phosphorus cycle involves the movement of phosphorus through the lithosphere, hydrosphere, and biosphere. It includes processes such as weathering, erosion, and the uptake of phosphorus by plants and animals.

Water Cycle

The water cycle, also known as the hydrological cycle, is the continuous movement of water between the atmosphere, land, and oceans. It includes processes such as evaporation, condensation, precipitation, and runoff.

Study Guide

1. What are biogeochemical cycles?
2. Explain the carbon cycle and its key processes.
3. Describe the nitrogen cycle and its importance in ecosystems.
4. Outline the phosphorus cycle and its role in plant growth.
5. Discuss the water cycle and its significance for life on Earth.
6. Compare and contrast the different biogeochemical cycles.
7. Examine the human impact on biogeochemical cycles.

Understanding biogeochemical cycles is essential for comprehending the interconnectedness of Earth's systems and the impact of human activities on these cycles.