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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.
Deep currents follow the hills and valleys of the ocean floor. They also carry cold water from the poles back to the equator and travel much more slowly than surface currents. What happens when surace waters and deep ocean waters mix. Upwelling which is the upward movement of cold water from the ocean depths.