Across
- 2. its atomic number is 80.
- 5. mid-west in america, dust blown by wind.
- 7. used to kill plants.
- 10. particles carried from construction.
- 12. 1 carbon and 2 oxygen atoms.
- 13. caused by industrial air pollution and transportation.
- 14. a layer of the atmosphere and a toxic molecule.
- 16. A way of farming or a hill and preventing soil loss
- 17. used to kill bugs.
- 18. used to promote plant growth.
- 19. its atomic number is 16.
Down
- 1. the destruction and moving of soil.
- 3. humans on Earth.
- 4. to maintain something at a certain level
- 6. Its atomic number is 82
- 8. A period with little to no water
- 9. factories and other mechanical production facilities.
- 11. water found under ground.
- 15. an agency that protects the environment.
- 18. A large part of ground erosion and deforestation