Here's why:
* Dissolution: Limestone is primarily composed of calcium carbonate (CaCO3). When acidic groundwater (often due to dissolved carbon dioxide) comes into contact with limestone, it dissolves the calcium carbonate.
* Karst Features: This dissolution process creates distinctive landforms and features known as karst topography. These include:
* Sinkholes: Depressions in the ground formed by the collapse of the roof of a cave.
* Caves: Underground cavities formed by the dissolution of limestone.
* Caves: Large underground chambers formed by the dissolution of limestone.
* Stalactites and stalagmites: Formations found in caves created by the deposition of calcium carbonate from dripping water.
* Karst springs: Springs that emerge from underground and often have a high flow rate.
So, the dissolution of limestone by groundwater is a key process in the development of karst landscapes.
