Physics
A small drop of oil spreads over water because :

Water has a higher viscosity
Oil has a higher viscosity
Water has a higher surface tension
Oil has a higher surface tension

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Physics
The earth is a

Non-absorber of heat
Good reflector of heat
Bad absorber and bad radiator of heat
Good absorber and good radiator of heat

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Physics
Thermohaline circulation is mainly due to

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

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