Across
- 3. each American makes about 4 pounds of _____ per day
- 7. include underground telephone lines, power lines, satellite dishes and cell phone towers
- 8. humans _______ or change the environment
Down
- 1. use ditches and canals to bring water from place to place
- 2. water that has less than 1% salt
- 4. the farming industry
- 5. gradual breaking down of rocks and soil
- 6. garbage dumps