March 1, 2018 4:51 pm Posted by: dimi

Do not get confused because the planet is blue. The color of water in the sea appears blue because it is reflecting the blue light from the Sun’s rays and absorbs other colours. Try to fill in your bathtub with water: Water in a glass appears without colour but in high quantity it starts getting a kind of azure colour because of light reflection .

The deeper we go more light is absorbed and thus the sea appears blue. Sometimes the plants and whats is inside the oceans contributes to the color of the sea. Have you ever noticed that the water that is surrounded by green forests appears slightly green? Its all part of the reflection. Also small lakes when the sky is cloudy appear slightly grey but when sunny appear blue, but as mentioned it is the light of the sun that gives water the blue colour.

However the sky is blue because of Rayleigh scattering Rayleigh scattering causes the blue hue of the daytime sky and the reddening of the sun at sunset and not because of the reflection of the sea. You can see more information here: https://en.wikipedia.org/wiki/Rayleigh_scattering.

So even if there were no oceans on Earth the colour of the sky would still appear blue due to the atmosphere and not due to the reflection of the sea as the majority of the population believe.