Across
- 6. this is when there are too many nutrients (nitrogen) in waterways, which makes oxygen less
- 8. this is needed to transform nitrogen into a usable form for plants and animals
- 10. this sphere includes all water on Earth
- 13. gravity causes this to fall to Earth's surface when clouds become too heavy with liquid
- 16. this can flow into waterways if too many people use it to grow plants
- 17. animals release carbon dioxide in the atmosphere when they exhale
- 18. this process is when plants absorb carbon dioxide from the atmosphere and change the carbon into carbohydrates
- 19. liquid water from plant leaves changes to water vapor because of the Sun's heat
Down
- 1. this cycle relies on the sun and gravity to move through and around Earth
- 2. this sphere includes all living organisms, bacteria, and fungi
- 3. this is the change from water liquid to water vapor due to the Sun's heat
- 4. this is the largest reservoir of nitrogen
- 5. this is the largest reservoir of carbon
- 7. this element is needed for plants and animals to make proteins, amino acids and DNA
- 9. magma is part of which sphere
- 11. occurs when water vapor turns into liquid water because of the cold atmosphere
- 12. these contain carbon, so when burned, they add carbon dioxide into the atmosphere
- 14. this and bacteria break the nitrogen gas bonds so that nitrogen can bond to other elements
- 15. this term is when nitrogen is changed by bacteria to allow for plants to consume the nitrogen