1. The Carbon Cycle: This cycle involves the movement of carbon through the Earth's atmosphere, oceans, land, and living organisms. Carbon is essential for life and plays a key role in regulating Earth's climate. It is released into the atmosphere through processes like respiration, combustion, and volcanic eruptions, and removed from the atmosphere through photosynthesis, absorption by oceans, and deposition in rocks.

2. The Nitrogen Cycle: This cycle focuses on the movement of nitrogen, which is a critical element for living organisms, particularly for building proteins. It primarily involves the conversion of nitrogen gas in the atmosphere into usable forms, such as nitrates and ammonia, through biological processes like nitrogen fixation and denitrification. These processes are performed by bacteria and microorganisms.

3. The Phosphorus Cycle: This cycle tracks the movement of phosphorus, an essential nutrient for plant growth and development. Phosphorus is primarily stored in rocks and released through weathering. It then moves through different compartments, including soil, water, plants, and animals. Phosphorus is not readily found in the atmosphere like the other two cycles.

These geochemical cycles are interconnected and crucial for sustaining life on Earth. They play a role in regulating the composition of the atmosphere, the availability of essential nutrients, and the climate.