The third planet from the Sun, and the fifth-largest of the eight planets in the Solar System. It is also the largest, most massive, and densest of the Solar System's four terrestrial planets. It is sometimes referred to as the World, the Blue Planet.

You can find on This great Encyclopedia more information about the Eath.

The index on this Encyclopedia :

- Planet Earth
- Composition and structure
- Atmosphere of Earth
- Orbit and rotation
- Habitability and more ...

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The Earth Encyclopedia