Across
- 2. A common non-metallic element
- 4. Living things collectively
- 8. Any organism of microscopic size
- 9. Everything that exists anywhere
Down
- 1. The organic chemistry of compounds
- 3. The theory that the universe was made by an explosion
- 5. A very light colorless element
- 6. The star that is the source of the light and heat
- 7. All the planets and space
- 8. A gas used as fuel