Simplicity
This photo is showing a burning building but it has simplicity because the background is not complicated and it helps the focus on the subject.
Balance
In this photo is building with smoke in the air if you were to put a line through the middle it would be somewhat symmetrical.
Lines
The building has a bunch of lines on it and is broken by the crash in the middle on it caused by the plane.
Avoiding mergers
George, Hillary, and Rudolph tour the worlds trade mark.In this photo there is no merging between the tree subjects.
Framing
In this photo is the broken building outlines the man on the ladder leading our focus to him.
Rule of thirds
In this photo Andrew Card is informing former president George bush that the second plane has hit the tower. George and Andrew's conversation is in the top right corner making us focus in that area.