Physics
Why does the sea appear blue in colour?

Refraction of the sun light
Reflection of the sun light from water surface
Interference of the sun light from water surface
Scattering of the sunlight by water molecules

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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
Warm water being added to the ocean due to industial waste
Cold, dense ocean water sinking and warmer water replacing it

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