Physics
The sky appears blue because of

Scattering of light
Reflection on sea water
Atmospheric water vapour
Emision of blue wavelength by the sun

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Physics
Pressure Cooker cooks faster because

Boiling point decreases with rise of pressure
Higher temperature is attained for cooking
It cooks the food at low pressure
The material of the cooker is a good conductor

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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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