Physics
Which of the following uses a Non Renewable Energy Source?

Tidal Power Plant
Nuclear Power Plant
Wind Mill Power Plant
Hydro Electric Plant

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Physics
Skating on ice is possible because

Ice is cold
The surface of ice is smooth
The pressure on the ice due to skate raises its melting point
The pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water

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