Across
- 3. It is on the Colorado River that creates a man-made lake.
- 4. When nature or humans make the air dirty and unsafe to breathe.
- 6. Doing this after a forest fire and create new habitats for animals so they can return to live.
- 7. these are built by humans and beavers. They change the ecosystem and the ways streams flow.
- 9. When nature and humans make the water dirty and unsafe to drink.
Down
- 1. A material that is found in nature and that is used by living things.
- 2. Natural and human changes to the ecosystem that can destroy habitats and kill living things.
- 5. When animals and people are able to survive changes to their environments and live.
- 8. These can destroy the tops of mountains and cause landslides.