Across
- 2. plants and animals that have migrated to places where they are not native
- 3. An increase in the average temperature of the earth's atmosphere (especially a sustained increase that causes climatic changes)
- 8. The removal of trees faster than forests can replace themselves.
- 9. Natural situation in which heat is retained in Earth's atmosphere by carbon dioxide, methane, water vapor, and other gases
- 11. Rain containing acids that form in the atmosphere when industrial gas emissions (especially sulfur dioxide and nitrogen oxides) combine with water.
- 13. Coal, oil, natural gas, and other fuels that are ancient remains of plants and animals.
- 15. A chemical intended to kill insects and other organisms that damage crops.
- 18. at the lower part of the stratosphere absorbs bio harmful solar UV radiation
- 19. Largest number of individuals of a population that a environment can support
- 20. Chlorine compounds that are the main cause of ozone depletion.
Down
- 1. The development of industries for the machine production of goods.
- 4. a pesticide that targets species of insects and other invertebrates that consume crops
- 5. Breakup of a habitat into smaller pieces, usually as a result of human activities.
- 6. the total carbon dioxide emissions produced by an individual, group, or location
- 7. A habitat in which the fresh water of a river meets the salt water of the ocean.
- 10. A species whose numbers are so small that the species is at risk of extinction
- 12. An increase in the percentage and in the number of people living in urban settlements.
- 14. the diminishing of a conditioned response; occurs in classical conditioning when an unconditioned stimulus (US) does not follow a conditioned stimulus (CS); occurs in operant conditioning when a response is no longer reinforced.
- 16. A material found in air, water, or soil that is harmful to humans or other organisms
- 17. Convert waste into reusable material.