What happens if the earth consist of pure oxygen

Well, oxygen itself isnt flammable, but it is what means that everything else can burn. So if the whole atmosphere was oxygen then things would be really easy to set fire to and then everything else flammable would set fire around them too.

Since wxyz is 4, halfof that would be 2.

This question has already been answered by someone else.here is a link.  hope that it .