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Environment |
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ACROSS 2. air pollutant 4. cancer-causing natural radioactive gas 6. liquid metal 8. ecosystems 12. frozen water in the form of snow 15. soils, sediments, and rock layers of the Earth's crust 17. Can cause fever and shortness of breath 18. Global 200 20. Serbian mathematician (1879-1958) 22. contain extraordinary plant richness 23. environmental protector 24. endangered species 26. areas inundated by ground water 27. nutrient enrichment 28. chemically transform a substance by combining it with oxygen 29. river | DOWN 1. marine animals of the class Anthozoa 3. exploratory hole drilled into the Earth or ice to gather geophysical data 5. atmospheric condition at any given time or place 7. drainage basin 9. average weather 10. raise their young in wetlands 11. air closest to the Earth's surface 13. antimicrobials 14. compounds containing either chlorine, bromine or fluorine and carbon 16. extent to which the Earth's orbit around the Sun departs from a perfect circle 19. one of most popular species 21. hazardous 25. highly toxic metal |
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