Answer: Eutrophication
Step-by-step explanation:
The rapid growth of the plant life and the death of the animal life in a shallow body of water as a result of the excessive growth of the plants and animals remains in organic or inorganic form is known as eutrophication.
It is a natural process which converts freshwater into marsh and then dry land, but the interference of the human activities can accelerate the process.
This process takes place in the water bodies.