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Across 3. so that we don't run out of raw materials we should ... 5. having oxygen removed from a substance, we say the substance has been 7. the negative electrode 8. extracted in the blast furnace 9. aluminium ore 11. these particles flow through the electrical (electrolysis) circuit 12. adding oxygen to a substance, we say the substance has been 15. metals which exist as 'pure' in nature 16. least reactive metal in our reactivity series 17. the positive electrode

Down 1. metals combined with other elements in rocks 2. using electricity to extract a metal 4. non-metal roasted with medium reactive metals, to extract them 6. used to reduce temperatures for electrolysis of aluminium 10. most reactive metal in our reactivity series 13. used for electrical wiring 14. electrolysis can be used to separate and purify metals or to ..... items