reply to post by Tussilago
North face of WTC 7 was black granite
South face was red granite
Difficult to see because of smoke and dust
Can see WTC 6 in some of the shots (low building usually to the right)
Debris from WTC 1 dropped onto it and smashed hole in center of building
almost like a donut
Verison (140 West) - large masonary building can be seen to left in some
shots
If look close on shots (clips 5,6, 7, 8)
Can see smoke and soot blacking windows on west exposure
www.911myths.com...
As for WTC 7 collapsed and WTC 6 didn't - becuse of differences in
construction
WTC6 was small 8 story building of conventional construction
In this link aerial shot of destruction - also note map of area
en.wikipedia.org...
WTC 7 was 47 stories built over Con Ed substation - it was twice the
size originally envisioned for the site. To build it required some extreme
engineering in form of long span cantilever truss for support
Fires started by WTC 1 collapse burned out of control for hours
After the North Tower collapsed, some firefighters entered 7 World Trade Center to search the building. They attempted to extinguish small pockets of
fire, but low water pressure hindered their efforts.[29] A massive fire burned into the afternoon on the 11th and 12th floors of 7 World Trade Center,
the flames visible on the east side of the building.[30][31] During the afternoon, fire was also seen on floors 6–10, 13–14, 19–22, and
29–30.[3] In particular, the fires on floors 7 through 9 and 11 through 13 continued to burn out of control during the afternoon.[32] At
approximately 2:00 p.m., firefighters noticed a bulge in the southwest corner of 7 World Trade Center between the 10th and 13th floors, a sign that
the building was unstable and might collapse.[33] During the afternoon, firefighters also heard creaking sounds coming from the building.[34] Around
3:30 pm FDNY Chief Daniel Nigro decided to halt rescue operations, surface removal, and searches along the surface of the debris near 7 World Trade
Center and evacuate the area due to concerns for the safety of personnel.[
Fire on 13th floor caused column to buckle and pull adjacent columns
down - which in turn caused floor in area to collapse resulting in
progression to roof. Can see this in shot where the penthouse collapses
into the building just before the general collapse of structure
On August 21, 2008, NIST released its draft report on the causes of the collapse of 7 World Trade Center, beginning a period for public comments.[32]
In its investigation, NIST utilized ANSYS to model events leading up to collapse initiation and LS-DYNA models to simulate the global response to the
initiating events.[44] NIST determined that diesel fuel did not play an important role, nor did the structural damage from the collapse of the twin
towers. But the lack of water to fight the fire was an important factor. The fires burned out of control during the afternoon, including on floor 13,
where a critical interior column buckled. With the buckling of that column, adjacent columns also failed along with the floor structure above. This
triggered a vertical progression of floor failures to the roof. The collapse then progressed east-to-west across the structure, and ultimately the
entire structure collapsed. The fires, fueled by office contents, along with the lack of water, were the key reasons for the collapse.[45]