Across
- 5. to use things like energy, fuel, materials, food, water, etc.
- 9. carrying harmful bacteria or toxins that can cause disease or death
- 12. Phương Mai
- 13. to keep something in its original state
- 14. the protection and preservation of natural environments and resources
- 15. Quốc Đạt
Down
- 1. the complex system of relationships between living things and their environment
- 2. Minh Thư
- 3. the contamination of the environment
- 4. to make something new from materials that have been used before
- 6. Khương Sang
- 7. to put waste in the wrong place
- 8. Bích Vân
- 10. no longer existing or lost forever
- 11. Đức Trí
- 12. to reduce as much as possible