↑   Estimates range throughout the world, but most resources provide a determine of two–4kg of bauxite for each 1kg of alumina. The sole lighter metals will be the metals of teams 1 and 2, which apart from beryllium and magnesium are as well reactive for structural use (and beryllium is extremely https://sheds-and-garages68890.blogripley.com/38309171/aluminium-greenhouse-options