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== Shape and structure ==
[[File:The Blue Marble.jpg|thumb]]
Earth is a terrestrial planet. This means it is made up of solid rock unlike a gas giant such as Jupiter. It is the largest out of the four terrestrial planets in mass and diameter. The Earth's shape is an oblate spheroid. This means it is basically a sphere but it bulges around the middle. The [[circumference]] of the Earth is about 40,000 kilometers; the average width of the Earth is about 12,700 kilometers. The highest point on Earth is the peak of Mount Everest at 8,848 meters above sea level. The lowest natural point is the bottom of the Mariana Trench at 10,911 meters below sea level. Because of the bulge at the middle or the equator, the farthest point from the Earth's center is the top of Mount Chimborazo in Ecuador.<ref>"Origin of the Moon and Earth". Reisch, Maggy. Nature.com: Volume 10:2, p.19-27. http.www.nature.com/102/Reisch/Earth. Retrieved 2009-07-28.</ref>
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