The sand and rocks in the soil is where phosphorus and trace minerals come from. Ideal soil has a combination of living carbon, dead carbon, and minerals. The

The sand and rocks in the soil is where phosphorus and trace minerals come from. Ideal soil has a combination of living carbon, dead carbon, and minerals. The fungi and bacteria breakdown the minerals along with weathering and make it available to plants. All the living carbon builds itself from the dead carbon. The dead carbon came from dead plants that pulled the carbon from the air with photosynthesis.