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1) different materials used in the buildings,
2) the different materials have different tolerances to heat and generally react differently to heat,
3) different fuels igniting the fire,
4) heat from the fire likely different temperatures due to the fuels,
5) different construction methods,
6) different architecture and design, and
7) a big-ass plane was also embedded at over 400 mph into the frame of the WTC, severing a significant portion of the support for the upper floors.
easy - next question please!
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