EARTH

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 is our home planet. Scientists believe Earth and its moon formed around the same time as the rest of the solar system.

They think that was about 4.5 billion years ago. Earth is the fifth-largest planet in the solar system.

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