What happens first in eutrophication?

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Prepare for the Water and Air Pollution Test with flashcards and multiple-choice questions, complete with hints and explanations. Ace your exam preparation!

Multiple Choice

What happens first in eutrophication?

Explanation:
Eutrophication starts when extra nutrients enter the water. This nutrient input—often from fertilizer runoff, sewage, or detergents—provides the fuel that allows algae and aquatic plants to grow rapidly. Once those nutrients are available, an algal bloom can develop as the algae proliferate. After the bloom, when the algae die and decompose, bacteria use a lot of oxygen, leading to oxygen depletion. Warm temperatures can speed up these processes, but they don’t initiate them. So the first event is the influx of nutrients into the water.

Eutrophication starts when extra nutrients enter the water. This nutrient input—often from fertilizer runoff, sewage, or detergents—provides the fuel that allows algae and aquatic plants to grow rapidly. Once those nutrients are available, an algal bloom can develop as the algae proliferate. After the bloom, when the algae die and decompose, bacteria use a lot of oxygen, leading to oxygen depletion. Warm temperatures can speed up these processes, but they don’t initiate them. So the first event is the influx of nutrients into the water.

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