Questions About Earth
- It is the only planet that has an atmosphere containing 21 percent oxygen.
- It is the only planet that has liquid water on its surface.
- It is the only planet in the solar system that has life.
- The Earth is the only inner planet (Mercury, Venus, Earth and Mars) to have one large satellite, the Moon.
Earth Facts - Planet Earth - Earth For Kids - Planets For Kids
www.planetsforkids.org/planet-earth.html
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