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Across 6. HIGHLY DEVELOPED NATIONS 7. STUDYING SURROUNDINGS WITH THE SENSES 9. IRREPLACEABLE SUBSTANCES USED BY HUMANS 15. NON-SUSTAINABLE USAGE OF RESOURCES 16. SUSTAINABLE AMOUNTS OF SUBSTANCES USED BY HUMANS 17. ABREVIATION FOR A PESTICIDE 18. SCIENTIFIC PREDICTION OF WHAT WILL HAPPEN 19. THIN LAYER OF LIFE AROUND THE EARTH 20. POISONING OF AIR, WATER, OR SOIL 21. DYING OFF OF A SPECIES 22. SEEKS TO ANSWER QUESTIONS ABOUT NATURAL WORLD 23. USES INFORMATION FROM PURE SCIENCE RESEARCH

Down 1. NATIONS JOINING MODERN WORLD 2. GROUP OF ORGANISMS THAT LIVE AND BREED TOGETHER 3. HOW HUMANS INTERACT WITH THE ENVIRONMENT 4. STUDIES HOW LIVING THINGS RELATE 5. GUARANTEEING FUTURE FOR GENERATIONS NOT YET BORN 8. TESTING A HYPOTHESIS UNDER CONTROLLED CONDITIONS 10. NON-SUSTAINABLE AMOUNT OF ENTITIES 11. TRADITIONALLY OR CULTURALY IMPORTANT TO A GROUP 12. EVERYTHING THAT SURROUNDS US 13. NATURAL SUBSTANCES USED BY HUMANS 14. COMPOUND RELEASED IN AIR BY HUMAN ACTIVITY