Across
- 4. many stars together
- 5. Object orbiting a planet and made of ice and dust
- 9. our star
- 10. Movement of water to the atmosphere
- 13. biggest planet of the system solar
- 14. Main constituant of the air
- 15. Top part of the Earth
- 17. closest planet to the sun
Down
- 1. Represent about 20% of the air we breath
- 2. big object orbiting a star
- 3. all the living organisms on Earth
- 6. Layer of earth under the Crust
- 7. essential Life element which is part of a cycle
- 8. Object orbiting a planet
- 11. object orbiting a star and made of rock and metal
- 12. lower part of the atmosphere
- 15. gas causing climate change
- 16. Inner part of the Earth made of Iron and Nickel