The difference in the tint of the waters above the continental shelf (greenish)and the deep blue of the open ocean is due to:

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The greenish tint of waters above the continental shelf is due to the high level of photosynthetic productivity. This area receives more sunlight and nutrients, which allows for more algae and phytoplankton growth. This, in turn, gives the water its greenish color. In comparison, the deeper waters of the open ocean have less nutrient and sunlight availability, resulting in a deeper blue color.

The Difference in the Tint of the Waters Above the Continental