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OCR: THE EARTH ASTRONOMICAL SYMBOL THE EARTH IS THE third planet from the Sun and the largest of the four inner planets. The Earth's internal structure is similar to that of the other inner planets, consisting of a solid metal inner core surrounded by a molten metal outer core, followed by layers of molten, semimolten, or solid rock Conditions at the surface, however, are very different: no other planet has liquid water or an oxygen-rich atmosphere, and no other planet is known to support life. The Earth's slow evolution over the last 4.5 THE EARTH billion years will continue both naturally FROM SPACE and as a result of human actions. SEL PLANET PROFILE THE EARTH'S CONTINENTAL THE THE INHABITED NEXT ALSO HISTORY DRIFT MAGNETOSPHERE PLANET