The primary purpose of covering an algae-prone impoundment is to

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Multiple Choice

The primary purpose of covering an algae-prone impoundment is to

Explanation:
Blocking light to algae is the best approach because algae need light to perform photosynthesis and grow. When a cover blocks sunlight, the energy source for algal growth is removed, so blooms are slowed or prevented, which helps keep the water cleaner and easier to treat. Increasing nutrients would feed algae, not stop them. Raising pH isn’t the direct goal of covering; it isn’t achieved by simply blocking light. Increasing evaporation isn’t the purpose either; a cover typically reduces evaporation rather than increases it.

Blocking light to algae is the best approach because algae need light to perform photosynthesis and grow. When a cover blocks sunlight, the energy source for algal growth is removed, so blooms are slowed or prevented, which helps keep the water cleaner and easier to treat.

Increasing nutrients would feed algae, not stop them. Raising pH isn’t the direct goal of covering; it isn’t achieved by simply blocking light. Increasing evaporation isn’t the purpose either; a cover typically reduces evaporation rather than increases it.

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