Across
- 2. the process where plants use sunlight to make their food (sugar)
- 4. the greenhouse gas associated with climate change
- 5. these organisms have a large effect on the abundance and type of organisms in an ecosystem
- 6. the study of changes in the human population
- 8. protects us from UV radiation
- 13. species that provide an early warning of environmental change
- 15. a shift towards powered machinery, factories, and mass production
- 16. species that are non native and harmful to an ecosystem
- 17. non-living things
- 18. these types of gases keep Earth warm enough for life
Down
- 1. the pigment that makes plants green
- 3. the name of this class
- 7. rain with a pH of less than 5.6
- 9. species on the verge of going extinct
- 10. measures the resources needed to support one's lifestyle
- 11. living things
- 12. the variety of life on Earth
- 14. coral that has expelled its symbiotic algae due to high temperatures