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Why is the ocean blue?

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The ocean appears blue primarily because of how sunlight interacts with water. Here's why:

  1. Scattering of Light: Sunlight is made up of all colors of light, which combine to appear white. When sunlight enters the ocean, water molecules absorb longer wavelengths of light, like red, orange, and yellow, more effectively than shorter wavelengths like blue. The blue light is scattered, which makes the ocean appear blue to our eyes.

  2. Depth Effect: The deeper the water, the more pronounced the blue color becomes because other colors are absorbed completely at greater depths.

  3. Reflection of the Sky: Although the ocean’s blue color mainly comes from scattering, the reflection of the sky can also enhance the blue appearance, especially when the water is calm.

These factors together give the ocean its characteristic blue color.

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