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Solar System: Earth Discuss this eTheme

Learn about Earth, the fifth largest planet in our solar system and the largest planet among inner planets. Find out what made our planet suitable for life to be created. Learn about the planet’s rotation, geological composition, atmosphere, hydrosphere, gravity and other necessary components for species to survive on its surface. The sites include photographs, audio, puzzles, quizzes, and hands-on activities.

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创建日期: 2004年5月18日 04:56 | 更新日期: 2012年12月11日 16:30