Across
- 2. All the water in the planet.
- 5. The amount of living organisms in the planet.
- 6. The name of our planet.
- 8. The most common gas in the Atmosphere.
- 10. The air that surround the Earth
- 12. The opposite of East
- 13. Hydro means ________.
Down
- 1. The rocky part of the Earth
- 3. The center of the Earth.
- 4. We need this gas to live.
- 7. The hard surface of the Earth.
- 9. The opposite of South
- 11. The layer of liquid rock under the surface of the Earth.