Across
- 2. Organic material that can be added to soil to help plants grow
- 4. Farming that avoids synthetic pesticides and fertilizers
- 7. The continuous movement of water on, above, and below Earth's surface
- 8. A community of interacting organisms and their environment
- 11. Energy derived from the sun
- 13. Effect trapping heat in Earth's atmosphere by certain gases
- 15. Variety of life in a particular habitat or ecosystem
- 16. Animals living in their natural environments
- 18. Clearing of forests for non-forest use
- 19. Natural home of a plant, animal, or other organism
- 20. Process of converting waste into reusable material
Down
- 1. Contamination of the natural environment by harmful substances
- 3. Gradual destruction of land by wind, water, or other natural forces
- 5. Energy source that can be replenished naturally
- 6. Areas of land saturated with water, important for wildlife
- 9. Long-term patterns of temperature and weather in an area
- 10. Element commonly found in fossil fuels, contributes to global warming
- 12. Layer in the atmosphere that protects Earth from harmful UV radiation
- 14. Meeting our own needs without compromising the future
- 17. Protection of natural resources to prevent depletion