From the ZDF HISTORY "BBC documentary" about World Trade Center 7 (WTC7):
A solid Wheatchex
The Metal fumes as it disintegrates.
It looses shape
becomes soft, splits into parts
The substance is lost?
Please see for yourself.
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The building appears to be dissolving into powder. We don't we see any solid parts of a falling building, here.
WHERE DID THE BUILDING GO?
GZ workers walk in thick dust atop the rubble pile, hardly higher than the lobby level.
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only holograms can do that!
Prepositioned explosive charges go off inside the building.
How the gash was created (WTC1, first "impact")