Lack/limited of Engineering knowledge in the medieval-era.Creep in the underlying marine clay.The unstable mixture of soil – caused the tower to sink to the south side.Soil at south side compressed faster than the north side – weight of the tower was the main factor of tilt.Tilting was also due to the fluctuations of the water levels. This caused the tower to keep shifting, as well as rotate…later discovered by scientists that the tower’s position shifted in relation to the ground water level.
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