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Video: WTC-7 demolition.
This video shows the WTC-7 demolition. Please, note that the building 7, unlike the Twin Towers, was completely pulverized - from bottom to top. So, the pattern of the WTC-7 collapse was very different - there was no heavy undamaged top that might crash down, scattering the dust. The entire WTC-7 was a pile of dust. So, it simply collapsed into the underground cavity left by a recent nuclear explosion and melted there, save for some of its minor parts that ended up around the hole. Pulverization of the WTC-7 is not so easy to notice, but you can still perceive it if you look at the two distinctly different sources of dust - one "delaying" dust that belonged to the very top of the WTC-7, and one - "ascending" dust that began to ascend from the WTC-7 footprint after its collapse. In any case, the WTC-7 still reminded a "building" only during the first stage of its collapse; starting from the second half - it did not look like "structure" any longer. The pattern of the WTC-7 collapse is easy to understand also if you look at the drawing on the right showing distribution of damages and compare the WTC-7 height with the height of the Twin Towers.
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