Our Planet Earth is called the “Blue Planet” because it appears blue when seen from sky.
But the question is why our planet appears ‘Blue Planet’ from sky?
The planet Earth contains more than two-thirds of the its surface covered with water in the form of oceans, lakes, glaciers & other water bodies. Due to abundance of these water bodies on its surface, the earth appears blue from outer space.
But what is the role of these water bodies in the said phenomena?
According to the National Oceanic and Atmospheric Administration (NOAA), when sunlight hits the ocean, the water strongly absorbs long-wavelength light (red, orange and yellow end of the light spectrum), as well as very-short-wavelength light (violet and ultraviolet end of the light spectrum). The remaining light (mostly made up of blue wavelengths) returns to atmosphere. Hence, thus this Planet appears blue from sky and called Blue Planet.
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