The intense fire heat tended to crumble the cement/stone to a 3 story high pile of dust/gravel mixed with rebar and other metal scrap.
First time in history fire melted steel. /s
Do you know how long the collapse of each tower took? ... very close to the speed of gravity. Had there been actual structural components in the path of the upper floors falling, the collapse would have taken much longer.
The dust billowing down the streets when the first tower collapsed was not hot, not scotching the people flee from it when overtaken. Yet hundreds of cars and trucks and busses several blocks away appear to have been burned, or at least 'oxidized'.
I'm sorry, but the conventional official story of what ended the towers is no longer credible. Yes, two planes were hijacked and flown into the towers. No, the vast majority of steel and aluminum and concrete and funishings did not fall to ground in the bathtub. Do you have any idea how many metal file cabinets were int he two towers, and how many were found int he ruble pile which did not collapse into the basements of the towers which were still structurally composed and had firefighters goign through them with the lights still on, looking for any survivors?