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The sea appears blue primarily because of the way water interacts with sunlight. Here’s why:
1. Absorption of Light: Water absorbs colors in the red, orange, and yellow portions of the light spectrum more effectively than it absorbs blue. This means that when sunlight hits the water, the red and yellow wavelengths are absorbed, leaving the shorter blue wavelengths to scatter and be reflected back.
2. Scattering of Blue Light: Similar to the sky, blue light is scattered by water molecules. However, this effect is less pronounced than in the atmosphere.
3. Reflection of the Sky: While the primary reason for the sea's blue color is water's absorption and scattering properties, the reflection of the blue sky can enhance the blue appearance, especially on clear days.
4. Depth and Clarity: The color of the sea can vary based on its depth and clarity:
In deeper waters, there’s more absorption of other wavelengths, making the blue more intense.
In shallower or murkier waters, the presence of particles, sediments, or algae can give the water green, brown, or even red hues.
Summary:
The sea appears blue because water absorbs red and yellow light and scatters blue, and the reflection of the sky can also contribute to its color.
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