Limestone is a sedimentary rock largely composed of calcium carbonate (CaCO 3). Rocks with more than 50% calcium carbonate are considered to be limestone. Around 20 to 30 million years ago, when the climate was warmer and the crust of the earth was mainly submerged under shallow seas, conditions were ideal for limestone formation. Limestone rocks are important to the landscape design industry for their natural beauty and durability and to the construction industry as a major building stone and aggregate.

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