Is marble the same as limestone?

The main difference between limestone and marble is that limestone is a sedimentary rock, typically composed of calcium carbonate fossils, and marble is a metamorphic rock. Limestone forms when shells, sand, and mud are deposited at the bottom of oceans and lakes and over time solidify into rock.

What materials were used to build the Tower of Pisa?

The study of the subsoil revealed an inter-layered clay-type material washed by subterranean waters. The foundation for the Tower of Pisa was laid in 1173, constructed mainly of marble and lime; the tower was built in a circular ditch, about five feet deep, over ground consisting of clay, fine sand, and shells.
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