Physics
Scalar Quantities are

Physical quantities which have no magnitude and no direction
Physical quantities which have magnitude only and direction
Physical quantities which have no magnitude only and only direction
Physical quantities which have magnitude only and no direction

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Physics
Thermohaline circulation is mainly due to

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

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Physics
The sky appears blue because

In white light, the blue component dominates
It is actually blue
The atmosphere scatters blue colour more than the others
All colours interfere to produce blue

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