Stalagmites and stalactites
Stalactites are stalactites that grow from the cave ceiling towards the ground. Those growing from the floor upwards are called stalagmites. When the two combine, they are called stalagmites. The material that forms the stalactites is called sinter. A prerequisite for the formation of stalactite caves is a high content of dissolved minerals - usually lime - in the water, which are deposited in the cave.