Physics
Hydro-electric power is a:

Neither renewable nor non renewable resource
non-renewable natural resource
Renewable natural resource
A mixture of renewable and non-renewable natural resource

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Physics
We always see the same face of the moon, because

It is smaller than the earth
It takes equal time for revolution around the earth and rotation on its own axis
It rotates at the same speed as the earth around the sun
It revolves on its axis in adirection opposite to that ofthe earth

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