Leaning Tower Of Pisa: How has it survived 2 world wars and 4 strong earthquakes?
- The tower's height and stiffness, combined with the softness of the soil beneath it, causes the
of the tower to adjust so that the tower doesn't shake as much as the earth beneath it during an earthquake.
- In the efforts to slow down the collapse of the tower, 900 tons of lead weights were placed on the north side of the tower.
- Engineers installed equipment that allows them to make modifications to the water pressure beneath the tower, to help control the tilt, shifting it from
5.5 degrees to