Why does the burning of magnesium ribbon start the reaction between iron oxide and aluminium when making iron?

The reaction between iron oxide and aluminium needs a lot of heat to trigger at first. And iron oxide and aluminium can not be lighted directly. So we can use the burning of magnesium ribbon which is easy to be lighted to provide the heat and trigger the reaction. Then the reaction will release huge amount of heat which is enough to continue the reaction by itself.

For cyclohexane compounds drawn in a chair conformation:   -axial bonds are vertical  -equatorial bonds are parallel to two bonds within the ring.  thus, as i assume the chair conformation is drawn:   -the x group is in an axial position, as are the five other vertical bonds.  -three axial bonds are on the top face of the ring  -the other three axial bonds are on the bottom face  the position of the second substituent on each ring carbon is equatorial.  gauche groups must be on an adjacent carbon such as carbon 6 and carbon 2, and also gauche groups are rotated by 60 degrees relative to each other.  drawing the newman projections for c1–c2 and c1–c6 aids in visualizing the groups that are gauche to the y group on c1.  click this link and watch some academic videos that may you more understand the topic