Well, three assumptions are in progress. The most likely is that unqualified people have changed part of the structure support beams in some of the highest floors of the building, causing a cascading drop that hit the other two.
Supernovas occur when a massive star runs out of fuel and collapses under its own gravity, causing a powerful explosion that releases a huge amount of energy and creates new elements.
Any way you want to. This is the reason behind building a mouse trap car, to test your engineering skills.
Brazil's capital changed from Salvador to Rio de Janeiro for business reasons. It was more practical to export from Rio de Janeiro which was the main reason for the change.
Opportunity does not reason it knocks. The reason behind success is that it sure beats failure.
The primary reason for building the Great Wall of China was to keep out the barbarians from the north.
why means the reason behind it. SO YA!
The main reason for building the transcontinental was to transport good from the east to the west.
there is a reason behind every reason
The ukulele is a small stringed instrument. It doesn't require much in the way of materials, is easy to carry and to make music on. People like the size and the sound.
socialism
The reason behind an action.
Fannie Mae and Freddie Mac were not the reason behind the economic crisis.