Across
- 1. to protect something (noun)
- 5. to protect something (verb)
- 6. Something that can be decomposed naturally
- 8. A flowing body of freshwater
- 9. Something that cannot be decomposed naturally
Down
- 2. A large body of salt water
- 3. Water that has been used
- 4. Material that is non-biodegradable
- 7. Water that flows over the ground after it rains