Tornadoes <span>often form when cool, polar air travels southeastward from the Rockies overrides warm, moist' unstable Gulf of Mexico air in the eastern </span>states. During the spring.
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<h3> Based on its comprehensive investigation, NIST concluded that the WTC towers collapsed because: (1) the impact of the planes severed and damaged support columns, dislodged fireproofing insulation coating the steel floor trusses and steel columns, and widely dispersed jet fuel over multiple floors; No one escaped at or above the impact point in the North Tower. Clark's testimony before the 9/11 Commission, where he detailed problems with the 911 emergency call system, has been widely quoted.</h3>
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Many had different opinions on the constitution and different views on what the U.S should be like.
