In a flame given by a candle complete combustion takes place in the outer most part and then in the middle part there is incomplete combustion but when oxygen is present everywhere then why is it that in one part there is complete combustion and in the other not?

In a flame given by a candle complete combustion takes place in the ou

1.	In a flame given by a candle complete combustion takes place in the outer most part and then in the middle part there is incomplete combustion but when oxygen is present everywhere then why is it that in one part there is complete combustion and in the other not?
Answer» In a flame given by a candle complete combustion takes place in the outer most part and then in the middle part there is incomplete combustion but when oxygen is present everywhere then why is it that in one part there is complete combustion and in the other not?