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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.
Yes, the water pressure is higher at the bottom of any object than the top. That is what gives rise to the buoyant force (not sure if your pun was intended but I like it), and it is the exact same force on a beachball or a beachball sized piece of metal.