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ENERGY Alternative |
HYDROPOWER
Water constantly moves through a vast global cycle, evaporating from lakes
and oceans, forming clouds, precipitating as rain or snow, then flowing back
down to the ocean. The energy
of this water cycle, which is driven by the sun, has been used by
waterwheels to power mills and machinery, and by
hydroelectric dams
to generate electricity. Other potential
sources of hydropower are
tides and
waves.