Across
- 4. something that can be bought and sold
- 6. little things that can connect to make something big
- 9. to make something dirty
- 10. underwater life
- 13. causing grave harm
- 14. to annoy something
- 16. rubbish not in its place
- 17. toilet water
- 18. helps grow plants
Down
- 1. evaporation,condensation,precipitation and collection
- 2. the nature around you
- 3. something that pollutes
- 5. animals homes
- 7. a solid liquid or gas
- 8. in the middle of sand and clay
- 11. a chemical used to kill insects
- 12. a chemical used to kill unwanted plants or weeds
- 15. dirty water that smells