Physics
The blue colour of sky is due to

Refraction of sunlight
Reflection of sunlight
Scattering of longer wavelengths of sunlight in the atmosphere
Scattering of shorter wavelengths of sunlight in the atmosphere

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Physics
Thermohaline circulation is mainly due to

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

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