Eutrophication

Question 1

Explain the eutrophication process

Answer 1

Sewage and fertiliser run off into lakes
Adds excess nitrates to the water
Aquatic plants grow faster with the nitrates
(If algae) forms algal bloom
Blocks light from plants lower in the water
Death of the plants
Dead plants decomposed by aerobic bacteria
Bacteria use up oxygen
Less oxygen in water
Fish and other animals die