Physics
The redness in atmosphere at Sunrise and Sunset is due to :

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

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Physics
Radiocarbon is produced in the atmosphere as a result of

Action of ultraviolet light from the sun on atmospheric oxygen.
Collision between fast neutrons and nitrogen nuclei present in the atmosphere.
Action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere.
Lightning discharge in atmosphere.

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Physics
Thermohaline circulation is mainly due to

Winds causing circulation of ocean water
Warm water being added to the ocean due to industial waste
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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