Underground karst landform Cave Cave: It is a cavity in which groundwater is dissolved along the layers, joints or cracks of the soluble rock mass. There are generally two types: one is a horizontal type of cave, located near the groundwater level and has an exit near the valley. The second is a vertical type of cave. Underground river Underground river: Also known as "dark river", "volt flow". Because karst forms caves and underground passages in large areas of limestone, surface rivers often sneak into the ground to form dark rivers. Stone stalactite Stone stalactite: It is a calcium carbonate pile that hangs over the top of the hole and has an inverted cone shape. stalagmite Stalagmite: It is a calcium carbonate deposit that is increased from the bottom of the cave. The shape is cone-shaped, tower-shaped and disc-shaped. Stone pillar Stone column: It is a columnar body in which the stalactites and stalagmites grow relatively until the two are connected. The aqueous solution oozing down from the top of the cave continues to accumulate along the surface of the stone pillar, thickening the stone pillar. Shi Yan Dendrobium: When the aqueous solution containing calcium carbonate flows over the wall of the cave, the plated and layered calcium carbonate deposits due to the rapid escape of CO2, and the surface has a curved flow pattern, and the height can reach several tens of meters, which is very spectacular. Hole through Through the hole: After the formation of the underground cave, the original cave is lifted to the ground and the hole is formed. Crystal Chandelier,Indoor Chandelier,Indoor Lighting Hanging Chandelier,Gifts Made Of Porcelain Core Value Service Ends Yingkou Yuyuan Industrial Co.,Lit , https://www.made--in--china.com