Physics
The resistance of a conductor is inversely proportional to its:

Temperature
Resistivity
Area of cross section
Length

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Physics
Skating on ice is possible because

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 pressure on the ice due to skate raises its melting point
The surface of ice is smooth

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Physics
Thermohaline circulation is mainly due to

Warm water being added to the ocean due to industial waste
Warmer, less dense water sinking in the ocean and cold water replacing it
Winds causing circulation of ocean water
Cold, dense ocean water sinking and warmer water replacing it

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