acording to my coursebook, NEPTUNE is known as blue planet..........but as per your text EARTH is blue planet. Kindly look for it & clear my doubt.
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neptune is called blue planet because of the prescence of metane,carbon di oxide and carbon mono oxide in the atmosphere of neptune
earth is called blue planet because earth has 75% water (in area) and only 25% land by mass.
earth is called blue planet because earth has 75% water (in area) and only 25% land by mass.
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