Physics
The blue colour of water in the sea is due to

Scattering of blue light by water molecules
Reflection of blue light by impurities in sea water
Absorption of other colours except blue by water molecules
Reflection of blue sky by sea water

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Physics
Absolute Zero is defined as

At which water boils at 298K
At which liquid Helium boils
At which the volume becomes zero
The temperature at which all molecular motion ceases

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