In nature, many limestone areas (mainly limestone) have formed strange peaks and caves for this reason, and stalactites and stalagmites have also grown. Stalactites are very different from stalagmites. They are like icicles hanging on the eaves in winter. Bamboo shoots that break out like spring. There are many cracks on the roof of the cave, and water drops are constantly oozing from each crack. Whenever water evaporates, it will leave some calcareous deposits. One drop, two drops, three drops ... water keeps appearing and volatilizing, and the lime at the top of the cave accumulates more and more, and finally a nipple is generated-this is the "childhood" era of stalactites. Later, the nipples were covered with layers of lime, which became longer and longer. Some stalactites can reach several meters long. Stalagmites are close partners of stalactites. When the water drops at the top of the cave fall, lime will also be deposited on the ground. In this way, stalagmites grow up against stalactites. It can be said that stalactites are "sir" and stalagmites are "epigenetic". But the stalagmite's chassis is large, relatively stable and not easy to break, so its "growth" speed is often faster than stalactites. Stalagmites can reach up to 30 meters, rising like a "stone pagoda". Downward stalactites are sometimes connected with upward stalagmites to form a stone pillar with thick ends and thin middle. People who don't know the details think who chiseled it. In many limestone caves, stalactites and stalagmites are mostly unrelated; That's because either the stalactite is broken or too much lime blocks the path of the water droplets, and the water droplets are forced to change their paths, move to another place, and grow new stalactites. So stalactites and stalagmites will not "meet". Groundwater plays a decisive role in the formation of stalactites and stalagmites. Wherever it flows, it will leave traces, or ditches or holes, or stalactites, or stalagmites, or stone pillars; When they are combined together, they become wonderful scenes such as "Woods" and "bead curtains". This phenomenon is often encountered in daily life: for example, the bottom of the pot used to boil water often forms a layer of scale. Take out some, add some vinegar, and you will see many bubbles. This is because tap water contains calcium bicarbonate, magnesium bicarbonate and so on. Some components of scale are their decomposition products when heated, such as calcium carbonate and magnesium hydroxide. Because the temperature of nature is not as high as that of boiling water, stalactites and stalagmites do not form so quickly. They are formed after tens of thousands of years of long-term deposition and constant change.