Across
- 2. Process that turns water into gas
- 4. Bacteria that turn nitrogen gas in the air to nitrogen-containing substances the plants can use to make their proteins
- 6. Process which plants use to make sugars and oxygen
- 10. Process that brings water down to Earth
- 11. Made up of about 78% nitrogen
- 12. Process which plants and animals use to make carbon dioxide, water, and energy
- 13. In the soil; breaks down plant proteins from dead plants and animals
Down
- 1. Something that turns nitrates back into nitrogen gas
- 3. Eat plant proteins, or they eat others with plant proteins
- 5. Repeated sequence in which water moves around Earth and the atmosphere
- 7. Examples of this are rivers, lakes, oceans, etc.
- 8. Absorb nitrates dissolved in water through their roots
- 9. Involves photosynthesis and respiration
- 12. Process that turns gas into water