eli5 Why is water transparent in a glass but blue when it is in the ocean?

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My wife gave birth to a philosopher. If you come up with an experiment I can show my 6-year-old son I’d appreciate it.

In: Earth Science

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There is a spectrum of colours in the light that goes by the acronym VIBGYOR. White light consists of seven colors namely Violet Indigo Blue Green Yellow Orange and Red.
Atmosphere consists of air that contains so many gases. When light (from the sun which is white) enters the atmosphere it collides with all kinds of particles. Due to this, colours with different wavelengths from the spectrum filter out except the colour blue that our eyes make out because of the distance and angle of the sun throughout the day. At dawn and dusk (when distance between sun and observer is greater than in the noon) you will see red tint because red colour has more wavelength than all the other colours.

For the glass, you can see it from the side, but the ocean you cannot. The surface of water in glass will also reflect the colour that is directly overhead it. Also, the size of glass is so small that you could easily change your perspective to take a look at it which may cause different colours from different POVs.

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