Across
- 6. development of land for houses and other buildings near a city
- 7. the removal of large areas of forests for human purposes
- 8. the process of restoring land disturbed by mining
- 9. the largest number of individuals of a given species that Earth's resources can support and maintain for a long period
- 11. all the members of a species living in a given area
- 12. involves planting trees to replace trees that have been cut or burned down
- 13. the natural process that occurs when certain gases in the atmosphere absorb and radiate thermal energy from the Sun
- 14. rain or snow that has a lower pH than that of normal rainwater
- 15. a scale that ranks levels of ozone and other air pollutants (AQI)
Down
- 1. pollution from several widespread that cannot be traced back to a single location
- 2. caused when nitrogen and carbon compounds are in the air react in sunlight
- 3. an increase in Earth's average surface temperature
- 4. the development of desertlike conditions due to human activities and/or climate change
- 5. pollution from a single source that can be identified
- 10. the mix of both solid and liquid particles in the air