Physics
What is the reason for formation of Mirage in desert?

Refraction of light
Both Refraction and Total internal reflection of light
Reflection of light
Total internal reflection of light

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

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