Structure and History of the Leaning Tower of Pisa

The Leaning Tower of Pisa began leaning in 1178 due to inadequate foundations. Construction paused for nearly 100 years due to wars, allowing the ground to settle. Resumed in 1272, the tower was completed in 1372, leaning at 4 degrees. Over 600 years, the lean increased, prompting stabilization efforts in 1964. Engineers used lead weights and soil extraction to reduce the lean, ensuring stability for another 200 years.

What was the primary reason the Leaning Tower of Pisa did not collapse during its initial construction?

• The tower was built on solid rock.

• Construction was paused due to wars.

• The foundation was reinforced immediately.

• The builders corrected the lean immediately.

How did the builders compensate for the lean when the belfry was added in 1372?

• They built a new foundation.

• They added extra weight to the opposite side.

• They straightened the entire tower.

• They adjusted the construction to balance the lean.

What was the angle of the tower's lean when it was completed in 1372?

• 5 degrees

• 4 degrees

• 2 degrees

• 3 degrees

What temporary measure was taken in 1964 to stabilize the Leaning Tower of Pisa?

• Rebuilding the foundation

• Adding 900 tonnes of lead

• Constructing a new tower

• Filling the base with concrete

What was the result of the soil extraction process beneath the tower?

• The lean was reduced by half a degree.

• The tower leaned more.

• The foundation was weakened.

• The tower was straightened completely.