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Mention any two advantages and two disadvantages of producing hydroelectricity by building dams on rivers.

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Advantages:
(i) The generation of electricity, from water does not produce any environmental pollution.
(ii) Water energy is a renenable source of electric energy which will never get exhausted.
Disadvantages:
(i) A vast variety of flora and fauna (plants and animals) get affected.
(ii) Dams can be constructed only at a limited number of places.

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