Question

which of the following is a potential environmental impact of building large dams?
○ increase in fish population
○ flooding of surrounding areas
○ increase in groundwater levels
○ decrease in air pollution

Explanation:

To determine the potential environmental impact of building large dams, we analyze each option:

• "Increase in fish population": Dams often disrupt fish migration and habitats, so this is unlikely.
• "Flooding of surrounding areas": Building large dams involves impounding water, which can lead to the flooding of adjacent lands as the reservoir fills, making this a valid environmental impact.
• "Increase in groundwater levels": While dams can influence groundwater, flooding surrounding areas is a more direct and common impact related to the physical presence of the dam and reservoir.
• "Decrease in air pollution": Dams (for hydroelectricity) can reduce air pollution from fossil fuels, but this is a positive impact related to energy production, not a direct environmental impact of the dam's construction/impoundment like flooding.

Answer:

B. Flooding of surrounding areas