Across
- 5. The contamination of rivers, lakes, or oceans
- 6. The process of turning waste materials into new useful products
- 8. Decayed organic material used to improve soil fertility
- 10. A process where heat is trapped in Earth's atmosphere
Down
- 1. A natural flow of water that moves from higher to lower ground
- 2. The gradual increase in the Earth's average temperature
- 3. A natural event that causes serious damage or loss
- 4. The top layer of the Earth where plants grow
- 7. Natural event when water covers the land that usually dry
- 9. Unwanted or discarded materials from humans activities