http://georgewashington.blogspot.com/2007/10/explosive-evidence-wtc-was-too-hot.html

The government has been forced to admit that the fires in World Trade Center buildings 1, 2 and 7 were not hot enough to melt steel. That's because maximum temperatures reached by burning jet fuel, diesel, office supplies and equipment, and the other flammable material which could possibly have burned in the World Trade Centers are far below the melting point of steel.

But two pieces of evidence prove that temperatures within some parts of the Trade Centers were higher than the melting point of steel:

• Dr. Steven Jones found iron spheres in samples of dust from the World Trade Center which were collected by ground zero resident Janette MacKinlay. The existence of iron spheres in the WTC dust was independently verified by the government's U.S. Geological Survey itself.

Because iron melts at about the same temperature as steel. Indeed, the temperature needed to melt iron is almost twice the maximum temperature that can be generated by the fuel available in the Trade Center fires.

What, other than explosives producing enormous heat, could have produced temperatures hot enough to form the iron spheres?

• An expert stated about World Trade Center building 7, "A combination of an uncontrolled fire and the structural damage might have been able to bring the building down, some engineers said. But that would not explain steel members in the debris pile that appear to have been partly evaporated in extraordinarily high temperatures" (pay-per-view).

Steel evaporates at a temperature approximately twice as high as the melting points of iron and steel, and almost three-and-a-half times the maximum temperature that can be reached by fuel available in the Trade Center fires.

Therefore, it is beyond dispute that the temperatures actually present as the Twin Towers and Building 7 collapsed were simply much too hot to have been caused by fires ignited by exploding jet fuel.

What could have caused such high temperatures? Certain high-explosives put out extremely high temperatures.

There is substantial evidence of high-explosives in the Trade Centers. I will cite just two examples:

• The government itself describes an official photograph of molten metal pouring out of one of the Twin Towers rights before it collapsed (p. 48):

An unusual flame is visible within this fire. In the upper photograph {Fig 9-44} a very bright flame, as opposed to the typical yellow or orange surrounding flames, which is generating a plume of white smoke, stands out. The intensity of this flame is considerably brigther than normal flames.

• A paramedic captain stated "somewhere around the middle of the world trade center there was this orange and red flash coming out initially it was just one flash then this flash just kept popping all the way around the building and that building had started to explode the popping sound and with each popping sound it was initially an orange and then red flash came out of the building and then it would just go all around the building on both sides as far as could see these popping sounds and the explosions were getting bigger going both up and down and then all around the building" (pdf file; Google's web version is here).

Whatever caused the "very bright flame" and orange and red flashes was apparently hot enough to melt iron and to vaporize steel, even though burning jet fuel, office supplies and the other flammable materials present in the World Trade Centers could not have done so.

There was also molten metal under ground zero for months after 9/11. What caused that?