Easy
What is the process called by which excessive nutrients (like from fertiliser runoff) cause dense growth of algae in a water body, depleting oxygen?
Explanation
Explanation
Eutrophication occurs when excess nutrients (especially nitrates and phosphates from fertilisers/sewage) enter a water body, causing excessive algal growth; when the algae die and decompose, oxygen levels drop, harming aquatic life.
PRO TIP
Re-check your working by substituting the answer back into the original question.