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3. a chemical with the symbol S and atomic number of 16
4. the way VOC's enter the atmosphere
5. the estimated carrying capacity in billions of people of the Earth
8. the number of living organisms an area can hold
11. volatile organic compounds such as methane
12. the percentage of air pollution caused by transportation
13. lack of food
14. Effects plants by killing them and spotting them which ruin habitats
16. Reduces visibility
18. buried combustible geologic deposits of organic materials formed from decayed plants and animals that have been converted to crude oil, coal, natural gas, or heavy oils
19. the total number of organisms in a given area

1. cutting into hills an mountains to create slab edges to plant on and reduces erosion
2. a factor or situation the limits the population and holds it on the same number
3. the number in billions of people in the world
6. chemical compounds sprayed on plants to rid them of insects, rodents, and other pests so the plants have an easier chance to thrive
7. a gas in the atmosphere that absorbs and emits radiation
9. the application of controlled amounts of water to plants at needed intervals
10. the number of inhabitants in an area
15. a chemical compound that contains at least one oxygen atom and one other element in it's chemical formula
17. poisons that effect the environment in a negative way