Physics
Planets do not twinkle because

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

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Physics
Thermohaline circulation is mainly due to

Winds causing circulation of ocean water
Cold, dense ocean water sinking and warmer water replacing it
Warm water being added to the ocean due to industial waste
Warmer, less dense water sinking in the ocean and cold water replacing it

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Physics
Air moves from the region where the air ________

Humidity is low to the region where the humidity is high
Pressure is low to the region where the pressure is high
Humidity is high to the region where the humidity is low
Pressure is high to the region where the pressure is low

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