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Word Count: 305
On September 11th 2001 a great tragedy struck America Terrorists high-jacked airplanes and flew them into the two towers of the World Trade Center The towers approximately 1700 feet tall were built to withstand an airplane crash but the burning fuel was not accounted for At 846am the first plane hit the North Tower at the 96th floor The plane flew right into staircases and elevators in the core of the tower This prevented people from escaping The impact ignites more than 20000 gallons of jet fuel and scrapes away fireproofing insulation on the columns and floor trusses exposing the steel to temperatures as high as 2000 degrees Fahrenheit from the burning fuel The structural steel above and around the fire begins to expand and soften like heated plastic in the intense heat The exterior walls buckle Driven by 45000 tons above the floors pancake progressively collapsing the tower from within Several floors remain standing like a jagged stump but later collapse The north tower stood for 102 minutes It crumples to the ground in eight seconds The impact of the collapse was equal to a 20 magnitude earthquake At 903am the second plane slams into the tower at an angle near the southeast corner of the 80th floor and blasts a hole through the adjacent side wiping out many of the supporting columns and leaving the building aflame Weakened by the nearly 2000-degree heat the remaining columns buckle The top portion slumps toward the damaged corner and rotates slightly Unable to hold the top portions 110000-ton weight the tower crumples floor by floor Structurally crippled to a greater degree than its twin the south tower remained erect for 56 minutes before crumpling in 10 seconds The towers hit the ground at approximately 120 miles per hour There was nothing that engineers could have done to prevent this tragedy as it is not always expected
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