Physics
'Mirage' is an example of

Total internal reflection of light only
Dispersion of light only
Refraction and total internal reflection of light
Refraction of light only

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Physics
Thermohaline circulation is mainly due to

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
Warmer, less dense water sinking in the ocean and cold water replacing it

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