The soil erosion and the flowing of water bring about the distribution of some phosphorus from their reservoirs and it gets distributed in the soil. Thus it forms the phosphorus pool in the soil so that the plants can absorb phosphorus from the pool. Thus this phosphorus enters the food chain and reaches the animals. These phosphorus returns to the soil by the excretion of the animals and also by the death and decomposition of the plants and animals. Large amount of phosphorus is lost to the sea along with the run-off water. A small portion returned to land through fishes that we eat after catching from the sea. Remaining amount is deposited in the deep sea as deep marine sediments.
