spelling bee crossword

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Across
  1. 6. Capable of being maintained long-term without depleting resources.
  2. 7. River: The largest river by discharge volume in the world, located in South America.
  3. 9. The period of the day between afternoon and night.
  4. 10. A wide view of an area of nature, often with mountains or fields.
  5. 12. Layer of gases surrounding the Earth.
  6. 13. Contamination of air, water, or soil.
  7. 14. Study of interactions between organisms and their environment.
  8. 15. A nation with its own borders and government.
Down
  1. 1. To join or take part in an activity.
  2. 2. Water sport that involves riding waves on a board.
  3. 3. Offering your time and skills without expecting payment.
  4. 4. water: Important action to conserve a vital resource.
  5. 5. teeth: Daily activity to maintain dental hygiene.
  6. 8. do it!: Motivational phrase to start a task together.
  7. 11. Places where solid waste is deposited.