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
Cold, dense ocean water sinking and warmer water replacing it
Winds causing circulation of ocean water

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Physics
The nature of fuse wire is

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

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