Across
- 3. The process of turning from a liquid into vapor
- 6. Rain, snow, sleet, or hail that falls to the ground
- 8. A chemical that takes up 78 percent of the atmosphere
- 9. The process where plants make their own food
Down
- 1. the cycle whereby atmospheric oxygen is converted to carbon dioxide in animal respiration and regenerated by green plants in photosynthesis.
- 2. The process of breathing
- 4. A repeating cycle of processes during which nitrogen moves through both living and non-living things
- 5. the continuous movement of water within the Earth and atmosphere
- 7. The process of turning vapor turning into water