Physics
The sky appears blue because

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

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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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