Is the sea blue?

The blue of the sea mainly due to scattering of light by
molecules of water. Sunlight is made up of light waves of different wave lengths, each
of which is seen as different colour. The shortest light wave appears blue while the
longest, red.
When the white light is intercepted by particles of solid,
gaseous or liquid matter, the various colours get scattered. If the intercepting
particles are very tiny the shortest light waves get scattered the most.
When
sunlight hits the sea, it is reflected by the molecules of sea water. The molecules
being very small, they scatter the blue component of the light the most and so the sea
appears blue.