Leaning tower of Pisa?, (someone SMART)?

Question

why is the leaning tower of pisa, leaning?

Answer 1

In Superman IV it was Superman who first straightened it....then made it lean again.

Answer 2

It was not built on a solid foundation.  It started settling as they finished building it.  It will eventually fall over.

Answer 3

It is leaning because of the shallow foundations (only 3 meters deep) and the sandy sediment. It began to lean before the third storey was finished in 1274.... Long ago and still standing

Answer 4

i was recently in Italy and i overheard that they are trying to straighten it a bit so that it will not fall....they are removing some of the the ground beneath the upper side so that angle will not be so dramatic and dangerous

Answer 5

All I know is that the tower started leaning when it was being built.

Answer 6

The city is built on gravel and mud.  There are many buildings along the Arno River that lean.