So looking at 9/11 tragedy,what caused the tower collapse?

Answer 1

Fire??? Two large planes smashing into them at 600 mph full of fuel???

Answer 2

Jet fuel and flamable objects ( walls, desks, ect.) inside the building reaching tempertures high enough to weaken and partially melt the steel support structure of the buildings. When weakened enough, the weight of the buildings caused them to pancake down upon itself, one floor at a time.

Answer 3

Like with the bridge that buckled under the pressure from the heat of the gasoline tanker, it was obviously heat from airplane fuel.

Answer 4

Take a knife and chop off 20% of your leg. Set the remaining 80% on fire with jet fuel. Let's see how long you stand.

Answer 5

Is has already been done and here is a partial list:
Screw Loose Change Video. (Yes, it's finally here)
http://www.lolloosechange.co.nr/
Loose Trains
http://loosetrains911.blogspot.com/
Salon - The 9/11 deniers
http://www.salon.com/ent/feature/2006/06/27/911_conspiracies/index.html
SciAm blog about conspiracists' reaction to Shermer
http://sciam-editor.typepad.com/weblog1/2005/05/a_conspiracy_of.html

In These Times: Nightmares of Reason: Sorting fact from fiction in 9/11 conspiracy theories
http://www.inthesetimes.com/issue/26/15/feature1.shtml

The September 11 X-Files
http://www.thenation.com/blogs/capitalgames?bid=3&pid=66

Interview with Prof. Jonathan Barnett, an expert in structural and fire protection engineering who was one of the WTC investigators
http://www.wpi.edu/News/Transformations/2002Spring/fall.html

Snopes debunks "Hunt the Boeing", a conspiracy site based on Thierry Meysan’s (and David Ray Griffin’s) claim that a missile, not AA77, hit the Pentagon
http://www.snopes2.com/rumors/pentagon.htm

Wikipedia articles on conspiracy theory characteristics
http://en.wikipedia.org/wiki/Conspiracy_theories
http://en.wikipedia.org/wiki/Conspiracism
Journal Of Debunking 9/11 Conspiracy Theories
http://www.jod911.com
Engineers Explain WTC Collapse
http://www.architectureweek.com/2002/0529/news_3-1.html
Report Ties WTC Collapses to Column Failures
http://enr.construction.com/news/buildings/archives/040119.asp
IT WAS THE FIRE, CAUSED THE TWIN TOWER COLLAPSE - icivilengineer.com
http://www.icivilengineer.com/News/WTC/Fire.html
Simulation for the collapse of WTC after aeroplane impact - Lu XZ., Yang N., Jiang JJ. Structure Engineer, 66(sup.). 2003, 18-22
Bazant, Z.P., & Zhou, Y.
"Addendum to 'Why Did the World Trade Center Collapse? - Simple Analysis" (pdf)
Journal of Engineering Mechanics v. 128, no. 3, (2002): 369-370.
Brannigan, F.L.
"WTC: Lightweight Steel and High-Rise Buildings"
Fire Engineering v.155, no. 4, (2002): 145-150.
Clifton, Charles G.
Elaboration on Aspects of the Postulated Collapse of the World Trade Centre Twin Towers
HERA: Innovation in Metals. 2001. 13 December 2001.
"Construction and Collapse Factors"
Fire Engineering v.155, no. 10, (2002): 106-108.
Corbett, G.P.
"Learning and Applying the Lessons of the WTC Disaster"
Fire Engineering v.155, no. 10, (2002.): 133-135.
"Dissecting the Collapses"
Civil Engineering ASCE v. 72, no. 5, (2002): 36-46.
Eagar, T.W., & Musso, C.
"Why Did the World Trade Center Collapse? Science, Engineering, and Speculation"
JOM v. 53, no. 12, (2001): 8-12.
Federal Emergency Management Agency, Therese McAllister, report editor.
World Trade Center Building Performance Study: Data Collection, Preliminary Observations, and Recommendations
(also available on-line)
Gabrielson, T.B., Poese, M.E., & Atchley, A.A.
"Acoustic and Vibration Background Noise in the Collapsed Structure of the World Trade Center"
The Journal of Acoustical Society of America v. 113, no. 1, (2003): 45-48.
Glover, N.J.
"Collapse Lessons"
Fire Engineering v. 155, no. 10, (2002): 97-103
Marechaux, T.G.
"TMS Hot Topic Symposium Examines WTC Collapse and Building Engineering"
JOM, v. 54, no. 4, (2002): 13-17.
Monahan, B.
"World Trade Center Collapse-Civil Engineering Considerations"
Practice Periodical on Structural Design and Construction v. 7, no. 3, (2002): 134-135.
Newland, D.E., & Cebon, D.
"Could the World Trade Center Have Been Modified to Prevent Its Collapse?"
Journal of Engineering Mechanics v. 128, no. 7, (2002):795-800.
National Instititue of Stamdards and Technology: Congressional and Legislative Affairs
“Learning from 9/11: Understanding the Collapse of the World Trade Center”
Statement of Dr. Arden L. Bement, Jr., before Committee of Science House of Representatives, United States Congress on March 6, 2002.
Pinsker, Lisa, M.
"Applying Geology at the World Trade Center Site"
Geotimes v. 46, no. 11, (2001).
The print copy has 3-D images.
Public Broadcasting Station (PBS)
Why the Towers Fell: A Companion Website to the Television Documentary.
NOVA (Science Programming On Air and Online)
Post, N.M.
"No Code Changes Recommended in World Trade Center Report"
ENR v. 248, no. 14, (2002): 14.
Post, N.M.
"Study Absolves Twin Tower Trusses, Fireproofing"
ENR v. 249, no. 19, (2002): 12-14.
The University of Sydney, Department of Civil Engineering
World Trade Center - Some Engineering Aspects
A resource site.
"WTC Engineers Credit Design in Saving Thousands of Lives"
ENR v. 247, no. 16, (2001): 12.
The Towers Lost and Beyond
http://web.mit.edu/civenv/wtc/
Massachusetts Institute of Technology
Eduardo Kausel, John E. Fernandez, Tomasz Wierzbicki, Liang Xue, Meg Hendry-Brogan, Ahmed F. Ghoniem, Oral Buyukozturk, Franz-Josef Ulm, Yossi Sheffi

Answer 6

Gravity made them collapse...if there were no gravity then those buildings would have floated into the atmosphere years ago.

Answer 7

It just had to be G W Bush, he's the same guy who made my tire go flat today.

Answer 8

Well, I'm gonna take a shot and the dark and say..
two large airplanes running into them at a high speed, probably at a downward angle, and then exploding..?

conspiracy theories make me sick. you people should be ashamed of yourselves.

http://news.yahoo.com/s/ap/20070620/ap_on_re_us/attacks_simulation

Answer 9

This is a little old. Check the other 500 questions refering to this...

Really, you have to ask ?

Answer 10

Gee, maybe crazy weak-minded islamic loons crashing innocent victims in planes into them?

Thats just a guess on my part but it seems accurate.

Vince