Across
- 3. Layer of gases surrounding the earth
- 7. Zone around the earth where life can exist
- 8. Living things, their remains, and features
- 10. Earth's solid outer layer
- 11. Non living components of an ecosystem
- 12. Organism that makes it's own food by converting sun's energy
- 13. Ability to maintain ecological balance
- 14. Form of energy converted into chemical energy
- 15. Visible form of radiant energy
Down
- 1. Sugar and oxygen converted into carbon dioxide and water
- 2. All living organisms and their habitat
- 4. Ecosystems maintained naturally
- 5. Energy travelling through empty space
- 6. Sun's energy converted into chemical energy
- 9. All of earth's water in solid, liquid, and gas form.