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Across 6. prepared by heating a mixture of 2 things in rhea absence of air 7. Fertilizer is essential for ____ _____ 8. a metal 10. type of explosive that is often unstable 11. reacts with ammonia and oxygen, forming nitrogen and water 12. Nitrogen and hydrogen are heated under pressure in the presence of iron 14. The boiling point of ______ is 1750 degrees Celsius 17. a thick, pale, oily liquid 18. leaches nutrients from soil, and makes trees die 19. explosions produce ______ products 20. deprived of phosphate minerals

Down 1. has a pH of about 5.6 2. created by Nobel 3. Nitrogen in air isn't useful for ______ 4. The only element in group 5A that isn't at room temperature 5. contain salts of nitrogen, phosphorus, and potassium 9. also used as a refrigerant 13. ammonia is used to manufacture ______ 15. power plants are the main source of ____ and nitrogen oxides 16. an explosion requires fuel and ______