Geoengineering

6. a mixture of very small solid or liquid particles that can spread in the air
8. a chemical that is often used as a fertilizer
10. the process in which atoms are deflected as a result of collision
13. the practice of growing only one plant on an area
14. energy from heat or light that you cannot see
16. the cutting of trees in a large area
17. chemical element being contained in all plants and animals
19. one of several gases, especially carbon dioxide, that prevent heat from the earth escaping into space (two words)

1. rain that contains large amounts of harmful chemicals (two words)
2. to become acid
3. the layer of gases surrounding the earth at a height of between 15 and 50 kilometres
4. a building in which CO2 is removed from air (two words)
5. changes in the world's weather, particularly an increase in temperature (two words)
7. very small plants that floats near the surface of water
9. the action of spreading a chemical substance on plants, in order to make the plants grow well
11. the process of burning
12. a heavy, colorless, suffocating gas (SO2) (two words)
15. the types of plants and animals that exist in a particular area
18. the amount of the light hitting a surface that it reflects back