Example of pale bluish gray redox depletions. Note the faint rusty orange concentration distributed throughout the soil matrix.

Reduction is the gain of electrons by a substance. It is also the loss of oxygen from a substance. For example, copper(II) oxide can be reduced to form copper when it reacts with hydrogen: ...

This is due to the cost and energy required to start the reaction in the first place meaning ... in south Wales, is a good example of a suitable site for a blast furnace.