Physics
When the Sun is near the horizon during the morning or evening, it appears reddish. The phenomenon that is responsible for this observation is

Refraction of light
Dispersion of light
Reflection of light
Scattering of light

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Physics
Thermohaline circulation is mainly due to

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
Warm water being added to the ocean due to industial waste

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