Across
- 2. negative charge
- 6. attribute of life
- 8. heaviest element that can be created by fusion
- 10. lightest element
- 12. life originates from asteroids
- 13. light up the universe
- 14. medium-size star
Down
- 1. formation of planets
- 3. basic building block of matter
- 4. earth's only natural satellite
- 5. contains the air we breathe
- 7. unicellular being
- 9. terrestrial planets
- 11. genetic material found in organisms
- 12. atomic number of an element