They turn limestone into calcium oxide, then into calcium hydroxide and then back into stone.

Watch....turning limestone into calcium oxide, then into calcium hydroxide and then back into stone.
Primitive technology.
The lime cycle.

This is how cathedrals produce their intricate "carvings" how the pyramids were built and how a lot of the old architecture was build

The Rocks are heated first to turn the calcium carbonate into calcium oxide then turned into calcium hydroxide with water...cement.

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