Across
- 5. A region on earth occupied by living organisms
- 6. Colorless and odorless gas that makes up a part of natural gas
- 8. Colorless and odorless gas that makes up a portion of earth's atmosphere, 1 carbon 2 oxygen
- 12. Flammable gas, consisting largely of methane and other hydrocarbons
- 13. Long-term shifts in temperatures and weather patterns
- 14. A natural fuel such as coal or gas formed from past organism that died
- 16. The crust and mantle of the earth
- 17. The rocks that make up the planet
- 19. Process of plants that intake Carbon dioxide and expel oxygen, the plant generates food and water for the plant
- 20. A forest, ocean, or other natural environment viewed in terms of its ability to absorb carbon dioxide from the atmosphere
Down
- 1. The total human presence on earth
- 2. The long-term weather conditions of a region
- 3. All the water on the earth's surface
- 4. A white or grayish solid produced by roasting calcium carbonate, its second name is quicklime
- 7. Form of energy resulting from the existence of charged particles
- 9. Colorless and odorless gas that makes up the second part of natural gas
- 10. The amount of carbon dioxide emitted due to the consumption of fossil fuels
- 11. The gases that envelope the earth
- 15. Matter that sits at the bottom of a liquid over a long period of time
- 18. A liquid mixture of hydrocarbons that is present in certain rocks