Why is the ocean blue?

The ocean appears blue because of the way water molecules absorb and scatter sunlight. When sunlight enters the ocean, it contains all colors of light, including red, orange, yellow, green, blue, and violet. However, water molecules absorb colors in the red part of the light spectrum more strongly than the blue part. As a result, the longer-wavelength red light is absorbed more quickly, while the shorter-wavelength blue light is scattered and reflected back to our eyes. This scattering of blue light by water molecules gives the ocean its blue color.

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