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Across 5. Salt formed when iron oxide reacts with sulfuric acid 7. This technique could tell you the number of dyes in a felt-tip pen 8. Igneous rock with large crystals formed underground 9. Rock type formed by deposition then compaction 11. Rock type formed by intense heat and pressure 13. This contains more than one type of atom chemically bonded together 15. Useful technique for getting pure water from sea water 16. Term for the breakdown of rock 17. This technique would be good for isolating a salt from its solution 18. Black glassy igneous rock formed in the sea 21. Type of physical weathering caused by the expansion of ice 22. Term for molten rock below the surface of the earth 23. Term for molten rock on the surface of the earth

Down 1. This contains more than one type of substance which are not chemically bonded to each other 2. Salt formed when lithium hydroxide reacts with hydrochloric acid 3. Light igneous rock which can float on water. 4. Metamorphic rock formed from limestone 6. This contains only one type of atom 7. Gas released when a metal carbonate reacts with acid 10. Salt formed when lead carbonate react with nitric acid 12. Gas released when zinc reacts with hydrochloric acid 14. This technique would be good for removing sand from water 19. Igneous rock with small crystals formed underground 20. Rock type formed when molten rock cools 21. Ancient remains of a plant or animal