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So, why does the water in the ocean or a deep swimming pool look blue?

This is mainly because of the kinds of light water absorbs.  White light can be split into different ‘wavelengths’ or colors of light; you can see this in a prism or a rainbow.  Water molecules absorb the red, orange, yellow, and green parts of the light.  The remaining wavelengths we can see with our eyes are blue, indigo, and violet.  This is why oceans or deep pools of water look bluish.

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