Across
- 3. fastest planet
- 4. basic unit of life
- 5. it is the building blocks of matter
- 8. examples of this are sun, earth's core
- 9. introduced dust and gases
- 11. all biotic and abiotic factors are here
- 13. Different species of organism that lives together in any given area
- 14. it constists of 71% of the earth's surface
- 16. introduced the idea of protoplanet hypothesis
- 17. it is 0.09% of the atmosphere
- 18. The habituable zone
- 19. it is the collection of ecosystem
Down
- 1. suggested Venus-Mercury and Earth-Mars were formed this way
- 2. it is the boundary between troposphere and stratosphere
- 6. boundary between crust and mantle
- 7. it creates magnetic field that protects the earth from the sun
- 10. it is 50-85km high up; slows down meteor
- 12. Considered as closed system
- 15. ice giant
- 18. water some example of this are well, springs, etc