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2 the metals obtained have a low density. 3 the metals obtained corrode easily. 4 metal ores are a limited resource. 5B It is better to recycle metal than extract it from an ore because … 1 digging up ores destroys the local environment. 2 recycling produces ‘smart’ alloys. 3 ores contain few impurities. 4 ores produce low-grade metals.