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The transitions of colour can also depend on the elevation of the viewer. At sea level the transitions can be spread out ie. you have a longer foreground, so see more of the lighter colour. As the viewer gains elevation the transitions reduce, so you see less light colour and more darker water. So from a cliff you would see more of the deeper, darker water.
Ice is less dense than water. If you look at this picture you can see that some of the iceberg is below the water level. This is not a surprise, but actually almost all of the volume of an iceberg is below the water line, not above it. This is due to ice's density being less than liquid water's density.