ECONOMICS
SCARCITY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Blue
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Green
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Red
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None
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Detailed explanation-1: -Over 71 percent of the Earth is covered with water. Therefore from outer space it appears blue and so Earth is called the ‘Blue Planet’.
Detailed explanation-2: -Earth is known as the ‘blue planet’ because of the vast oceans that cover two-thirds of its surface.
Detailed explanation-3: -Earth looks blue-green from space, depending on cloud cover, because of the high proportion of water on the surface. Planets with little or no atmosphere are seen in the color of their surfaces. Mercury is a rocky grey, while Mars is a butterscotch, reddish color (have a look at the Martian sky).
Detailed explanation-4: -Neptune’s atmosphere is made up of hydrogen, helium and methane. The methane in Neptune’s upper atmosphere absorbs the red light from the sun but reflects the blue light from the Sun back into space. This is why Neptune appears blue.