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Answer:
The passage of time is one cause. Buildings also collapse because of weak foundations. Earthquakes, hurricanes and other natural disasters can also damage the structure of buildings and cause them to collapse. Bomb blasts or building demolitions are other causes as well.
Answer:
As the term implies, "modulus of elasticity" refers to the elasticity or "flexibility" of a material. The value of modulus of elasticity is very important in relation to the deflection of some materials used in the construction industry. Take, for example, a common E value for mild steel is about 200 GPA compared to about 70 GPA for aluminum. This simply means that aluminum is 3 times more flexible than steel.
