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2 
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 Process for producing ammonia from nitrogen and hydrogen 
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4 
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A negatively charged electrode 
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5 
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A type of rock formed by high heat and pressure 
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6 
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The crust and top part of the mantle 
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7 
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A positively charged electrode 
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8 
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In the mantle causes the plates to move 
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10 
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Used to make fertilisers 
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11 
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The theory of Alfred Wegner 
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12 
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A type of rock that is formed by the deposition of material  
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14 
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Solution used to purify copper 
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