The geological parts of the phosphorus cycle are the processes that involve the movement of phosphorus through rocks, soil, and sediments. These processes are slow and can take millions of years.

Here's a breakdown of the geological parts of the phosphorus cycle:

1. Weathering: Rocks containing phosphorus (like phosphate rocks) are weathered by rain, wind, and other natural forces. This releases phosphorus into the soil and water.

2. Erosion: The weathered phosphorus is transported by rivers, streams, and runoff into lakes, oceans, and other water bodies.

3. Sedimentation: Over time, phosphorus settles at the bottom of these water bodies, forming sediments.

4. Geological uplift: Over millions of years, these sediments are buried deep underground and eventually uplifted to form new rocks. This phosphorus is now locked within these rocks, waiting to be released again through weathering.

These geological processes are key for the long-term storage and release of phosphorus, making it a finite resource on Earth.

It's important to note that the geological processes are slow and can take millions of years. The biological processes (like uptake by plants and decomposition) are much faster, but ultimately rely on the slow release of phosphorus from geological sources.