How are stalactites formed in caves in Wei Zi?

Karst caves are all distributed in the limestone mountain. The main component of limestone is calcium carbonate, which will react with water dissolved with carbon dioxide to produce more soluble calcium bicarbonate. When the water in which calcium bicarbonate is dissolved is heated or the pressure drops suddenly, the calcium bicarbonate dissolved in the water will decompose, so that calcium carbonate can be regenerated and deposited, and carbon dioxide will be released at the same time. When the water at the top of the cave slowly leaks downward, the calcium bicarbonate in the water will react as mentioned above. Some of them are deposited at the top of the cave, while others are deposited at the bottom of the cave. Over time, stalactites were formed at the top of the cave and stalagmites were formed at the bottom of the cave. When stalactites and stalagmites are connected, they form stone pillars.