Why earth is called a blue planet?

because more thn 3/4th part of earth is filled with water......so the earth occurs to be blue rather thn any other color

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because 75% of the earth is covered with water

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The Earth is called a blue planet because it's two third surface is covered by water therefore the earth is called a blue planet.

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The Earth is called Blue planet because the maximum surface is covwered by water and the color of water is blue.

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 it is also called Unique Planet

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because our earth are covered 72.5% with water !!

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as 72.5% is covered with water......

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