Across
- 1. The center of an atom
- 3. Table that lists all known elements
- 5. Acids have a low ___ level
- 6. An animal that only eats plants
- 8. The ability to do work
- 9. Natural home of an organism
- 15. Gas we breath in to stay alive
- 16. A scientist who studies weather
- 17. The system that includes your bones
- 18. Substance that carries genetic info
- 19. Smallest unit of an element
- 20. Rain, snow, sleet, or hail
Down
- 2. A shaking of the Earth's surface
- 4. Tool used to look at stars
- 7. The powerhouse of a cell
- 10. All the living and nonliving things in an area
- 11. Force that pulls objects toward Earth
- 12. Process plants use to make food
- 13. The layer of gases around Earth
- 14. Natural satellite of the Earth