Physicist Steven E. Jones has revealed abundant evidence that indicates the presence of an extreme incendiary material known as thermite, apparently utilized within the World Trade Center towers that collapsed on September 11, 2001. Thermite is a substance that can achieve temperatures of 4500 degrees Fahrenheit within seconds upon ignition and can penetrate and destroy the most durable steel materials available.

"Grayish white aluminum oxide ... streaming away from the reaction sites ...consistent with the use of thermite."

- Steven E. Jones - Physicist

"Mike Pecoraro ... worked ... deep below the tower ...  the room they were working in began to fill with a white smoke"

- Chief Engineers Association

                                                          http://www.chiefengineer.org/article.cfm?seqnum1=1029

Unusual clouds and streams of white smoke originating at the World Trade Center towers were photographed moments before and during the collapse of each tower.
 

Large amounts of possibly white aluminum oxide dust, streaming skyward approximately 90 seconds prior to the collapse of WTC 2:

The following pair of images were recorded during the collapse of World Trade Center 2, from the north and south sides of the building.  A white gaseous material can be seen streaming from openings within the building. This white material resembles the white aluminum oxide dust produced by thermite reactions. A collapse related piston effect is apparently creating air pressure changes that are forcing out the material in the form of sustained, high velocity streams. It is possible that thermite was used at these locations in order to cut vital core columns, that initiated total collapse. Theoretically, white aluminum oxide accumulated during thermite reactions at these floors and was expelled during collapse.
 

The following video captures reveal white smoke also emerging from the base of World Trade Center building 1 during its collapse:
 

Actual building demolition which visually corresponds with the above depiction:
 

White hot thermite reaction and streaming white aluminum oxide dust, produced by a thermite weld (left) and a similar bright white flame and streaming white smoke, within a region of WTC 2 from where molten material flowed moments later:
 

Molten material that strongly resembles molten iron produced by thermite reactions, emerging from the 81st floor of WTC 2, moments before its collapse.

This event at WTC 2 also coincided with the appearance of white smoke rising from the bottom of this same building, as seen earlier.

Molten iron created by an actual thermite reaction:

 

Molten material deposit recorded by photographer Alan Chin, 20 minutes after the collapse of WTC 2:

Potentially white aluminum oxide dust streaming away from a WTC 1 core column end, possibly severed by thermite:

Eroded WTC steel samples exhibiting sulfidation, recovered within the collapse zones of WTC 7 and one of the WTC towers (seen below).

The Journal of the Minerals, Metals and Materials Society states:

""Rapid deterioration of the steel was a result of heating with oxidation in combination with intergranular melting due to the presence of sulfur. The formation of the eutectic mixture of iron oxide and iron sulfide lowers the temperature at which liquid can form in this steel."
 

Physicist Steven Jones introduces the thermite hypothesis ignored by official investigations, that can explain the unusual evidence seen above:

"There is a straightforward way to achieve 1000°C temperatures (and well above) in the presence of sulfur, and that is to use thermate (or a similar variation of thermite). Thermate is a high-level thermite analog containing sulfur developed by the military  (see http://www.dodtechmatch.com/DOD/Patent/PatentDetail.aspx?type=description&id=6766744&HL=ON). Thermate combines aluminum/iron oxide (thermite) with barium nitrate (29%) and sulfur (typically 2% although more sulfur could be added). The thermate reaction proceeds rapidly and is much faster than thermite in degrading steel leading to structural failure. Thus, both the unusually high temperatures and the extraordinary observation of steel-sulfidation (Barnett, 2001) can be accounted for -- if the use of thermate is allowed in the discussion."

                                        http://www.journalof911studies.com/volume/200609/WhyIndeedDidtheWorldTradeCenterBuildingsCompletelyCollapse.pdf

Iron rich microspheres as seen under an electron microscope, recovered from dust located near to Ground Zero, indicating the presence of thermite reactions within the World Trade Center complex on September 11, 2001:

http://journalof911studies.com/volume/200704/JonesWTC911SciMethod.pdf