Eli5 Why is water see through?

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My 4 year old asked me and I think it’s a rather good question that I would like to answer so she understands. Thanks 🙏🏻

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Water is see-through because it lets light pass through it easily, just like when you look through a clean window. The light goes straight through the water without getting mixed up, so we can see things on the other side clearly. That’s why when we look into a pool or a clear lake, we can see fish and other things underwater.

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