Phosphorus cycling refers to the movement of phosphorus through the environment, primarily in soil, water, and living organisms. Unlike other nutrients, phosphorus does not have a gaseous phase and mainly exists in solid form. It is released from rocks through weathering and is absorbed by plants, which use it for growth and energy transfer. When plants and animals die, phosphorus returns to the soil or water through decomposition. Microorganisms play a crucial role in breaking down organic matter, releasing phosphorus back into the ecosystem. This cycle is essential for maintaining soil fertility and supporting life, as phosphorus is a key component of DNA and ATP.