Intact towers with GZ foreground
At least 99% of the non metallic mass of each twin tower was rendered into fine powder and gravel.
If you answered correctly, click here for your grand prize.
FOUND!
Here are the floor assemblies from WTC2. According to calculations, the amount of dust produced by the "collapsing" twin towers was enough to account for the building contents, including the 200,000 tons of concrete.