why did the twin towers fall

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why did the twin towers fall

The Twin Towers fell primarily due to the damages caused by the airplane impacts combined with the intense fires that followed. The planes' impacts damaged the buildings' external and core structural columns and dislodged fireproofing material, allowing the steel framework to be exposed to extreme heat. The fires caused the steel floors and columns to weaken and buckle, which led to a progressive failure of the floor trusses. This failure caused the exterior columns to pull inward and eventually led to the collapse of the towers. Specifically, the National Institute of Standards and Technology (NIST) and FEMA investigations concluded that the collapses were not due to the plane crashes alone or explosive devices but were primarily caused by the fires ignited by the burning jet fuel and building contents. The heat weakened the steel framework to a point where it could no longer support the load of the floors above. This initiated a domino effect where floors started to collapse onto the floors below, leading to a rapid, catastrophic collapse of the entire structure. The South Tower fell earlier because it suffered more structural damage from the initial impact than the North Tower.

The collapse of the Twin Towers is an example of progressive collapse, where initial structural failure cascades through the building, leading to total structural failure. Despite conspiracy theories, the official government investigations are clear that the combination of impact damage and subsequent fires caused the towers to fall.