The water consumption for both steel production, and zinc production via hydrometallurgy, is roughly 1.8 m3 water per tonne of ore. (i) Briefly explain why the water consumption per tonne of metal is so different roughly 2.9 m3 for steel but 26.3 m3 for zinc (1 mark). (ii) Which metals have the highest indirect water consumption (in both absolute and relative terms) (1 mark)? (iii) Briefly explain why this is the case (1 mark)?