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Which holds water until it is needed?

A. dams
B. reservoirs
C. aqueducts
D. valleys


Sagot :

Final answer:

Reservoirs behind dams store water for various uses like urban water supply and hydroelectricity.


Explanation:

Reservoirs are artificial lakes that form behind dams in rivers. They hold water until it is needed, providing benefits such as urban water supply, hydroelectricity, flood control, and recreation. Aqueducts, on the other hand, are structures that can move water from one place to another.


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