why is the earth called a planet
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The third closest planet to the sun is the earth. The planet looks blue from outer space since its two-thirds of the surface is covered with water, so it is called a blue planet. That is 71% of the earth is covered by water. ... The form of the Earth is defined as a geoid.
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it is only planets known to support life.
*it also has temperature range that supports life
*the proportion of water present is about two third of surface of water than land
*it has oxygen and water that allows life thrive
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