Day 7 Vocabulary

2. Discovery that mass is neither created nor destroyed in chemical reactions.
5. Organisms that obtain their energy from a chemical reaction
7. A mineral that naturally occurs in many foods and is also available as a supplement
13. Nonmetallic and tetravalent element
14. An element that exists in nature and can be found in soil, plants, foods, and water
15. A substance that provides nourishment essential for growth and the maintenance of life.
16. The process of converting nitrogen gas into ammonia, which spontaneously becomes ammonium
17. When water on the surface changes to water vapor
18. Found in bodies of water and in the soil

1. The process of converting natural nitrogen compounds into ammonia.
3. The movement of nutrients and other elements between biotic and abiotic factors
4. Environmental change caused or influenced by people, either directly or indirectly
6. When water vapor forms clouds
8. When ice and snow change directly to water vapor
9. When plants release water vapor through leaf pores
10. When water falls back to Earth as rain or snow
11. A process by which reduced nitrogen compounds are sequentially oxidized to nitrite and nitrate
12. Important component of nucleic acids, proteins, and other organic molecules