The ocean is blue because humans see it that way. To the human eye water absorbs colors in the red part of the light spectrum and similar to how a filter works, the colors that remain are in the blue part of the spectrum. The ocean will take on other colors at times. It can be seen as green or reb because the way light hits it and bounces off of it. This is also affected by sediments and particles in the water. Obviously the surface is what appears blue to us, because we can’t see most of the vast ocean. Some parts of the ocean are completely dark because no light reaches those depths. The dark parts can be found starting at 656 feet (200 m), where barely any light reaches. It gets completely dark at 3,280 feet (2000 m) below.
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