Across
- 3. Presence of harmful materials in an environment
- 4. The second most populous country in the world
- 5. Body of water flowing on Earth's surface
- 10. Microscopic single-cell organisms
- 11. A chemical used to kill microbes
- 13. A device used to remove impurities
Down
- 1. A body of dense ice
- 2. Sacred river in India
- 6. Process of turning liquid into vapor
- 7. A seasonal reversing wind that brings rain
- 8. A reptile with a bony shell
- 9. A person who uses science, technology, and math to solve problems
- 11. A polluting substance
- 12. The application of scientific knowledge