Earth

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Earthsearch for term: The third planet from the Sun in the Solar System, and the planet on which people live. The Earth orbits the Sun at an average distance of 1.0 A.U. and has a mass of 6x10^24 kg. It is made of solid, rocky materials such as iron, nickel, and silicon, and it has an atmosphere composed mainly of nitrogen, oxygen, argon, and carbon dioxide. Liquid water oceans cover 75% of the planet's surface. Earth has one moon.