canyon desert swamp river
I gave my students this multiple choice question: Laundry detergents were once manufactured to contain high concentrations of phosphorus compounds. When waste water containing these compounds ran off into lakes, the phosphorous became a nutrient to algae. As algae populations increased in the lakes, succession accelerated. Over a long time, which would a lake become as a result of the phosphorous in the detergent?

Only one answer is correct among these 4 choices:
- canyon
- desert
- swamp
- river

Could you tell me which one is correct?

swamp