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Particles that are small compared with the light wavelength scatter blue light more strongly than red light. Because of this, the tiny gas molecules that make up our Earthâs atmosphere (mostly oxygen and nitrogen) scatter the blue portion of sunlight in all directions, creating an effect that we see as a blue sky. Within the visible range of light, red light waves are scattered the least by atmospheric gas molecules.
To know first why the sea is blue it is essential to know why the sky is blue as there is a similar phenomena involved in both. The sky is blue as the particles existing in the atmosphere are reflecting the light of a shorter wavelength like blue after absorbing them. The absorbed light is later radiated and scattered.