the science in things

2. The total human presence on earth
7. Flammable gas, consisting largely of methane and other hydrocarbons
8. A forest, ocean, or other natural environment viewed in terms of its ability to
9. Colorless and odorless gas that makes up a part of natural gas
11. The crust and mantle of the earth
12. Matter that sits at the bottom of a liquid over a long period of time
13. A liquid mixture of hydrocarbons that is present in certain rocks
14. The rocks that make up the planet
17. Long-term shifts in temperatures and weather patterns
18. A white or grayish solid produced by roasting calcium carbonate, its second name is quicklime
19. Colorless and odorless gas that makes up the second part of natural gas
20. food and water for the plant

1. The amount of carbon dioxide emitted due to the consumption of fossil fuels
3. A natural fuel such as coal or gas formed from past organism that died
4. All the water on the earth's surface
5. Colorless and odorless gas that makes up a portion of earth's atmosphere, 1 carbon 2 oxygen
6. The gases that envelope the earth
8. The long-term weather conditions of a region
10. Process of plants that intake Carbon dioxide and expel oxygen, the plant
15. Form of energy resulting from the existence of charged particles
16. A region on earth occupied by living organisms