Across
- 5. a placewhere solar heat is transformed into energy
- 7. covered with soil and rocks
- 9. fossil fuel
Down
- 1. wood
- 2. a process of dirting the environment
- 3. able to be replaced
- 4. ancient prints of plants or animals in rock
- 6. material that produces heat when is burnt
- 8. a structure to prevent water from falling
- 9. cut