Across
- 6. Capable of being maintained without depleting resources or causing harm.
- 7. River: The second-longest river in the world, flowing through South America.
- 9. The period of the day from sunset to bedtime.
- 10. The visible features of an area of land, including natural and human-made elements.
- 12. The layer of gases surrounding the Earth.
- 13. The introduction of harmful substances into the environment.
- 14. The study of interactions between living organisms and their environment.
- 15. A nation or area distinguished by geographical boundaries.
Down
- 1. To take part in an activity or event.
- 2. A water sport in which individuals ride on waves using a board.
- 3. Offering time and skills for free to help others or the community.
- 4. Water: The practice of using water efficiently to prevent waste.
- 5. Teeth: Daily hygiene activity to maintain oral health.
- 8. Do It!: A rallying cry for taking action, often used in community service.
- 11. Sites where waste materials are disposed of and buried.