Eutrophication can be defined as:
1
the gradual increase in the concentration of phosphorus, nitrogen, and other plant nutrients in an grassland ecosystem
2
the gradual decrease in the concentration of phosphorus, nitrogen, and other plant nutrients in an aging aquatic ecosystem such as a lake
3
the gradual increase in the concentration of phosphorus, nitrogen, and other plant nutrients in desert areas
4
the gradual increase in the concentration of phosphorus, nitrogen, and other plant nutrients in an aging aquatic ecosystem such as a lake