Physics
It is easier to carry two buckets of water in one hand each, than to carry only one in one hand because

Weights of buckets are balanced
Centre of gravity falls within the body
Centre of gravity and centre of equilibrium fall within the feet
Resultant weight of buckets is zero

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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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