Q.

The planet known as the ‘blue planet’ is the _______.


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a

Earth

b

Mars

c

Jupiter

d

Pluto 

answer is A.

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Detailed Solution

The Blue Planet is another name for Earth. This is due to the fact that bodies of water such as oceans and seas make up two-thirds of the Earth. In seas and oceans, water molecules absorb most of the wavelength spectrum of sunlight, which includes infrared, red, and ultraviolet light. This leaves only the blue wavelength that is reflected from the water surface. The blue color of the earth is due to this blue wavelength.
 
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The planet known as the ‘blue planet’ is the _______.