Across
- 3. A large natural elevation above earth’s surface
- 6. A large natural stream of water
- 7. Something that a car produces when it burns fuel
- 8. A mound of earth that is naturally raised
- 9. Something that has a harmful effect to earth
- 11. The arts and other morals that groups of people follow
Down
- 1. The production or getting rid of something
- 2. A line separating two countries
- 4. A tiny portion of something
- 5. A gas that pollutes the air
- 10. A low area of land between two mountains or hills.