Across
- 7. a substance that provides nutrients to help crops grow better
- 10. the situation that arises when more soil nutrients are used than the decomposers can supply
- 11. a material that can be harmful if it is not properly disposed of
- 14. a long period of low precipitation
- 18. a brownish thick haze that is a mixture of ozone and other chemicals formed when pollutants react with sunlight
- 19. a landfill that holds nonhazardous waste such as municipal solid waste, construction debris, and some agricultural and industrial wastes
- 21. the process of restoring land to a more natural, productive state
- 23. pollutants that are released into the air
- 24. the process by which water, ice, wind, or gravity moves weathered particles of rock and soil
Down
- 1. a substance that causes pollution
- 2. the advance of desert-like conditions into areas that previously were fertile
- 3. the burning of solid waste
- 4. waste produced in homes, businesses, and schools and in a community
- 5. the process of reclaiming and reusing raw materials
- 6. a condition in which a layer of warm air traps polluted air close to Earth's surface
- 8. rock that makes up the Earth's crust; also the solid rock layer beneath the soil
- 9. the layer of soil below the topsoil that has less plant and animal matter
- 12. the crumbly, topmost layer of soil made up of clay and other minerals and humus
- 13. polluted liquid produced by water passing through and dissolving chemicals from buried wastes in a landfill
- 15. rain or another form of precipitation that is more acidic than normal, caused by the release of molecules of sulfur dioxide and nitrogen oxide into the air
- 16. capable of being broken down by bacteria and other decomposers
- 17. a colorless, odorless, radioactive gas
- 20. the very top layer of fertile soil made of dead leaves and grass
- 22. a form of oxygen that has 3 oxygen atoms in each molecule instead of the usual 2