Physics
Hydro-electric power is a:

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

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Physics
It is more difficult to walk on a sandy road than on a concrete road because

the friction between sand and feet is less than that between concrete and feet.
the friction between sand and feet is more than that between concrete and feet.
sand is soft and concreter is hard.
the sand is grainy but concrete is smooth.

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