What is the Colour of Sea?

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Sea waters are clear, but the colour of the sea appears due to the reflection of the sky. So with a grey sky, the sea will be grey. The deeper the water, the deeper is the colour. It appears blue on the surface of the ocean and then gradually darkens into violet and deep purple. This is because the light from the rays of the sun are made up of seven colours. As the light passes through water, these colours are lost one by one, the first colour starts vanishing at the depth of around 120-150 metres. At around 500 metres depth, we lose the blue and violet rays, and at 800 metres the deep purple. After this depth, all is darkness.

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