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acidic groundwater
The question has answered itself! The generic name for such landscape is 'karst', from the Slovac name for the type-area.
sinkhole
1 Running water on the surface of the earth erodes the land. Groundwater also can cause erosion under the surface. As water flows through the soil, acid is formed. This acid can cause minerals to be dissolved.2 Minerals that are carried in groundwater can also be deposited in other places. This cycle of erosion and deposition can cause underground caves to form. This happens especially in areas where there is limestone below the surface.3 A cave is an underground opening. It has a connection to the surface of the earth. A cave is formed by the erosion of limestone under the ground. The acid water moves through the cracks in the limestone and makes them larger.
When limestone is eaten away, it forms various features such as sinkholes, caves, and underground tunnels. This process occurs due to the dissolution of the limestone by acidic groundwater. The result is the creation of unique and sometimes expansive underground landscapes.
Limestone erodes with water. Limestone can also erode through water getting in to the cracks and then freezing. This causes the crack to expand and will begin to erode the limestone.
Soil
Groundwater forms features such as caves by moving downward due to gravity. Water follows the path of least resistance and slowly erodes whatever it passes over.
Limestone
limestone
limestone