why earth is called blue planet .
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Earth is called a blue planet because 70% of the land mass of Earth is covered with water. Therefore it is called blue planet.
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As we know that ¾ of earth is water. Hence when we look at the earth from the space we will find it blue intending that it has more water than land.
About 71% of the earth is only water. Hence, when we look at pictures of the earth taken from the space it looks almost blue. This is why earth is called a blue planet.
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