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Across 2. Measurements show that average temperatures around the world are rising. 3. Cover the iron with another metals 5. Process to make ammonia 6. causes significant damage to the central nervous system 8. Remove Carbon dioxide in carbon circle 10. gas forms when sulfur burns in air 13. Name of the process to make sulfur 15. How much pressure is needed to make ammonia in industry? 16. Plant need for making chlorophyl and protein

Down 1. Gas from the incomplete combustion of carbon 4. the sulfur trioxide is absorbed or dissolve into a solution of 98% sulphuric acid to produce a thick liquid 7. process used to remove large insoluble particles by passing the water 9. used to neutralise acidity in soil, and in lakes. 11. One of greenhouse gases 12. The corrosion of iron and steel has a special name 14. The catalyst needed to make sulfuric acid ?