Physics
Planets do not twinkle because

They are very far away from the earth resulting in decrease in intensity of light
They emit light of a constant intensity
Their distance from the earth does not change with time
They are nearer to earth and hence we receive a greater amount 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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