Why Is the Runoff from Fertilized Agricultural Fields,even If Free

question 41

Multiple Choice

Why is the runoff from fertilized agricultural fields,even if free of pesticides,often harmful to the ecosystems of temperate lakes?

• A)Runoff water pools at the lake's bottom,where the fertilizer compounds react with materials in the sediment to form toxic substances.
• B)The runoff is acid,and acidification kills key lake organisms.
• C)The runoff causes heavy growth of algae,which eventually die and decompose,causing oxygen depletion.
• D)Fertilizer compounds are toxic to fish.

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The field of physics concerned with the movement of objects and the influences of forces on that movement.

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The area of physics that explores how objects are moved and the impact of forces on their motion.