Question

What is the likely source of pollution if there are frequent algal blooms in a river?

Group of answer choices

warm water discharge from nearby factories

fertilizer runoff from nearby farms

acidification of the water from acid rain

oil discharge from a nearby oil rig

Answer 1

Fertilizer runoff from nearby farms

Step-by-step explanation:

Fertilizer contains an excess of nutrients, including phosphorus. When fertilizer runs into nearby waterbodies (such as rivers), algae uses these nutrients as a food source, and an algal bloom will occur due to that large sum of available nutrients.