Question

which statement best explains how the aswan high dam contributes to pollution?
fumes from the dams hydroelectric power plant affect the air quality.
waste and chemicals flow from the dam and result in ground pollution.
the dam cannot control flooding, which leads to water pollution along the river.
the dam affects the soil, which causes farmers to use fertilizers that create pollution.

Explanation:

Hydroelectric plants at dams produce very low fumes, so the first option is incorrect. The Aswan High Dam controls flooding, so the third option is wrong. While some runoff can occur, the key pollution link is that the dam traps nutrient-rich silt, depriving downstream soil of natural fertility. Farmers then rely heavily on synthetic fertilizers, which runoff into waterways causing pollution.

Answer:

The dam affects the soil, which causes farmers to use fertilizers that create pollution.