eli5: Why is water clear in small amount but blue in large amount like an ocean?

Question

I thought it might be the reflection from the sky but if that was the case, why does the ocean appears more blue the deeper you go?

In: 2918

Answer 1

The more and bigger amounts of water that light has to pass through means more of the light’s color is changed by the water. Little water means little change to color. A lot of water means a lot of change to color.