Physics
The law of conservation of energy states that

Energy can either be created nor destroyed
Energy can neither be created or destroyed
Energy can either be created or destroyed
Energy can neither be created nor destroyed

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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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