Quest for the Origin of Limestone
Between heaven and earth, there are many things, one of which is the source of calcium carbonate, which is limestone.

Limestone is widely distributed in mountains and rivers. Looking at its shape, it is either a layered rock or a sudden stone. Its color is often gray and simple.

The ancient ancestors, although they did not understand its chemical wonders, they made good use of it. In the industry of construction, limestone is fired into ash, and it is combined with sand, soil, etc., to build walls and foundations, which are very strong. With it as a material, a wide building can be built, and a fortress can be built, which will not fall over the years.

In the way of metallurgy, limestone is also very useful. In the furnace, it is co-smelted with the ore, which can remove impurities and help iron, copper and other metals to separate, so that the casting tool is excellent.

As for later generations, science has gradually flourished, and Fangming limestone is a rich source of calcium carbonate. After calcination, calcium carbonate is decomposed to obtain calcium oxide and carbon dioxide. Calcium oxide is widely used and indispensable in chemical industry and agriculture.

Limestone, although common in the world, is the source of calcium carbonate, and its contributions to human development cannot be underestimated.