The phosphorus cycle is a biogeochemical cycle which details the movement of phosphorus across Earth. Phosphorus is a common element which is essential to all life, as it forms ATP and DNA. While most abundant in the oceans as salt, it can also be found in the soil. This is because rocks in the ocean slowly move to land by geological processes, where they are weathered to become part of soil. In soil, plants absorb it, and it moves up the food chain. When these plants and animals die, it is returned to the soil. Runoff then returns phosphorus to the oceans. Phosphorus is always a solid in normal conditions, so it can not be found in the atmosphere.
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