Across
- 1. The first organisms to grow in a new or disturbed area.
- 5. Gases released into the atmosphere by vehicles, factories, and other activities.
- 6. Chemicals used to kill pests that can sometimes harm the environment.
- 7. A hardy organism that helps break down rock and create soil.
- 10. Non-living parts of an ecosystem, such as water, air, sunlight, and soil.
- 12. The gradual process of change in an ecosystem over time.
- 13. Taking responsibility for caring for and protecting the environment.
- 15. The natural place where an organism lives and finds what it needs to survive.
- 17. The rebuilding of an ecosystem after a disturbance where soil remains.
- 18. Turning used materials into new products instead of throwing them away.
- 19. Anything that slows down or stops a population from growing.
- 20. The food, water, shelter, and space organisms need to survive.
Down
- 2. The development of an ecosystem in an area where no soil or life existed before.
- 3. All the individuals of the same species living in one area.
- 4. Natural resources that can be replaced or replenished over time.
- 8. Living parts of an ecosystem, such as plants, animals, and bacteria.
- 9. Using resources in a way that protects them for the future.
- 11. A community of living things and their non-living environment working together.
- 14. A state of balance where a population remains fairly stable.
- 16. The largest population an ecosystem can support over time.