Ah, see, carbon can pull the oxygen away from iron oxide because iron is less *chaahe-waala* of that oxygen. But aluminium holds onto its oxygen so tightly, like my sister clutching her new phone! Carbon can't compete. That's what the diagram shows—aluminium's line sits much lower.
I think of it while boiling milk—if the fire is low, the cream clings to the milk. My little stove can't separate it, just like carbon can't separate that strong aluminium-oxygen bond. You need a much hotter *jadoo*, or a different trick altogether!
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