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

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

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Physics
Scalar Quantities are

Physical quantities which have no magnitude only and only direction
Physical quantities which have no magnitude and no direction
Physical quantities which have magnitude only and direction
Physical quantities which have magnitude only and no direction

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