DeletedUser
Guest
Heat weakens the structural integrity of metal, making it more malleable. The fuel of the plane caught fire and created varying sources of heat affecting the structural steel of the WTC. Varying temperatures causes significant stress on structural steel which lead to buckling failures.
Upper floors are weakened structurally and the weight of the floors above the steel causes the steel to buckle and collapse. Each layer falls and lands atop the layer below it. This added pressure leads to more heat and more structural damage. As each layer of the WTC collapses, the collapse picks up speed.
Congratulations, you fail to understand basic physics and chemistry. The picture, by the way, is for you to realize that heating up metal in order to weaken it structurally has been known for a few thousand years.
This.