What are the reasons as to why vast areas of land get submerged when dams are built?

There are many animals present around the dam site.

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The dam's wall across the river is too high.

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The water spreads over a large area.

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The density of human population around the dam.

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Solution

The correct options are
B The dam's wall across the river is too high.
D The density of human population around the dam.
When dams are built, vast areas of land get submerged. This is because the wall of the dam across the river is high and the water spreads over a large area.

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What are the reasons as to why vast areas of land get submerged when dams are built?

The correct options are B The dam's wall across the river is too high. D The density of human population around the dam.When dams are built, vast areas of land get submerged. This is because the wall of the dam across the river is high and the water spreads over a large area.

The correct options are
B The dam's wall across the river is too high.
D The density of human population around the dam.
When dams are built, vast areas of land get submerged. This is because the wall of the dam across the river is high and the water spreads over a large area.