1) What causes acid rain? a) Carbon Monoxide b) Sulfur 2) What is transition metal? a) Copper b) Helium 3) what is slag? a) waste b) good metal 4) what is global dimming? a) trapped air b) metal 5) what causes greenhouse gases? a) burning fuels b) metals 6) the............. table of elements . a) atoms b) periodic c) compounds 7) which is harder? a) titanium b) aluminium 8) limestone.......... slaked lime. a) quicklime b) lime 9) what are ores? a) rocks of metal b) rocks c) metal 10) what causes clobal warming? a) pollution b) gases c) metals

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