Across
- 3. A Southeast Asian island nation.
- 5. Long-term weather patterns in a region.
- 9. Progress made in a particular area.
- 13. The study of the Earth's physical structure.
- 15. Unwanted or discarded materials.
- 16. Resources Materials found in nature useful to humans.
- 17. The regions of Earth where life exists.
- 19. The process of deterioration or decline.
- 20. The layer of gases surrounding the Earth.
Down
- 1. Harmful substances contaminating the environment.
- 2. The study of interactions between organisms and their environment.
- 4. A systematic approach to understanding the natural world.
- 6. All the water on Earth's surface.
- 7. Variety of life in a particular habitat.
- 8. The Earth's solid outer layer.
- 10. The study of matter and its properties.
- 11. Water found beneath the Earth's surface.
- 12. Number of individuals living in an area.
- 14. The practice of farming.
- 18. Everything surrounding and influencing an organism.