Across
- 5. the impact of human activity to the natural world
- 7. a large animal with shaggy hair and horns
- 8. cutting down trees
- 10. a rock that is burned to fuel steam trains
- 11. animals that live in a certain area
Down
- 1. the amount of people in an area
- 2. a system of metal bars and wood planks used for supporting trains from one place to another
- 3. a group of Native American people living together
- 4. used to blow up mountains
- 6. big rocky land structures created by erosion
- 9. a system of plants and animals all working together