Change, Balance, Sustainability, & Environmental Stewardship

5. A state of balance where a population remains fairly stable.
6. Gases released into the atmosphere by vehicles, factories, and other activities.
7. The largest population an ecosystem can support over time.
8. The rebuilding of an ecosystem after a disturbance where soil remains.
13. A community of living things and their non-living environment working together.
15. The development of an ecosystem in an area where no soil or life existed before.
17. Non-living parts of an ecosystem, such as water, air, sunlight, and soil.
19. Using resources in a way that protects them for the future.
20. A hardy organism that helps break down rock and create soil.

1. Natural resources that can be replaced or replenished over time.
2. Anything that slows down or stops a population from growing.
3. The first organisms to grow in a new or disturbed area.
4. Chemicals used to kill pests that can sometimes harm the environment.
9. Taking responsibility for caring for and protecting the environment.
10. Turning used materials into new products instead of throwing them away.
11. The gradual process of change in an ecosystem over time.
12. The natural place where an organism lives and finds what it needs to survive.
14. All the individuals of the same species living in one area.
16. The food, water, shelter, and space organisms need to survive.
18. Living parts of an ecosystem, such as plants, animals, and bacteria.