Physics
Skating on ice is possible because

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
Ice is cold
The surface of ice is smooth

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Physics
The nature of fuse wire is

High resistance and low melting point.
High resistance and high melting point.
Low resistance and low melting point.
Low resistance and high melting point.

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