Physics
Hydro-electric power is a:

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

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Physics
It is dangerous to observe Solar eclipse with naked eyes because

All radiations from sun initiate chemical reactions in eyes
Infrared radiations from sun burn our retina
Ultraviolet radiations from Sun burn our retina
Cosmic rays reach eyes more during the eclipse

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