Limestone is a Sedimentary Rock Made up of the shells of millennia-old dead sea creatures Layers of these built up over millions of years and were squashed together until they formed Limestone. Limestone makes up about 10% of the total volume of Sedimentary Rocks The solubility of limestone in water and weak acid leads to a karst landscape, in which water erodes the limestone over the millions of years, most cave systems are through limestone bedrock The great pyramids of Egypt are, one of the seven wonders of the ancient world, its outside cover is made from limestone
