These bedding planes contain vertical cracks called joints. Joints and bedding planes make the rock permeable. Erosion of Limestone Weathering is the breakdown of rock by physical, chemical or biological processes. Limestone areas are weathered when rainwater, which contains a weak cabonic acid, reacts with limestone. When it rains limestone is dissolved.
Rainwater erodes the joints and bedding planes.
In doing this Karst scenery is created. Limestone pavements - Exposed clints and grykes. Stalactite - Water dripping from the roofs of caves leave behind microscopic particles of calcium carbonate. These build up as icicle shaped stalactites. Stalagmite - Drips splashing onto the cave floor create stalagmites.