Stalactites are formed by the deposition of calcium carbonate and the other minerals, which is precipitated from mineralized water solutions. Limestone is calcium carbonate rock which is dissolved by water that contains carbon dioxide, forming a calcium bicarbonate solution. This solution travels through the rock until it reaches an edge and if this is on the roof of a cave it will drip down. When the solution comes into contact with air the chemical reaction that created it is reversed and particles of calcium carbonate are deposited.
Every stalactite begins with a single mineral-laden drop of water. When the drop falls, it leaves behind the thinnest ring of calcite. Each subsequent drop that forms and falls deposits another calcite ring. Eventually, these rings form a very narrow, hollow tube commonly known as 'soda straw' stalactite. Soda straws can grow quite long, but are very fragile. If they become plugged by debris, water begins flowing over the outside, depositing more calcite and creating the more familiar cone-shaped stalactite. The same water drops that fall from the tip of a stalactite deposit more calcite on the floor below, eventually resulting in a rounded or cone-shaped stalagmite.
The stalactite cave has fairly stable climate conditions and the relative humidity level is usually close to 100%. So there are lots of water droplets which contained carbonate ion and bicarbonate radical ion in the roof of the cave, also in the air. On the other hand, a report published by the 'National Geographic' mentioned there are lots of caves in the world, and many of them have not been found.
I think if we can use the natural stalactite cave to form architecture space (like cave-dwelling in China), it can create some strange and fantastic space which we are not familiar with. Also, it can solve some public problems like land constraints.
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