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Why is the ocean blue?

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﻿Light absorbtion is the reason why the ocean is blue. Water acts like a filter and absorbs colors in the red spectrum, so the colors in the blue spectrum are left. That is why the ocean appears to be the color blue even though water is colorless.

The ocean can appear to be other colors, especially green. This is do to the debris (sediments and particles) that are floating in the water. sunlight bounces off the debris so that the ocean doesn't absorb all the red light. The deepest parts of the ocean hardly ever receives light. Very little light only pentrates to depths of 200 meters, and since the average depth of the ocean is 4267 meters, the water appears inky black.

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Why is the sky blue?

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WHY IS THE SKY BLUE?
The blue color of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by the air. However, much of the shorter wavelength light is absorbed by the gas molecules. The absorbed blue light is then radiated in different directions. It gets scattered all around the sky. Whichever direction you look, some of this scattered blue light reaches you. Since you see the blue light from everywhere overhead, the sky looks blue.


 * [[image:http://www.sciencemadesimple.com/img_sky/bluesky.gif align="center" caption="Blue sky from scattered light"]] ||

As you look closer to the horizon, the sky appears much paler in color. To reach you, the scattered blue light must pass through more air. Some of it gets scattered away again in other directions. Less blue light reaches your eyes. The color of the sky near the horizon appears paler or white.