GEOLOGY

Detailed explanation-1: -As the rock dissolves, cavities and caves develop underground. Drought, together with the resultant high groundwater withdrawal, can create favorable conditions for sinkholes to form.

Detailed explanation-2: -Two types of sinkholes exist. One forms when the roof of a cave collapses and exposes the underground cavern. The second type forms when water dissolves the rock underneath soil and creates an underground chasm. Without rock to support it, the soil layer collapses and creates a hole on the surface.

Detailed explanation-3: -Sinkholes also form when the roofs of caves collapse. Sinkholes are often funnel-shaped, with the wide end open at the surface and the narrow end at the bottom of the pool. Sinkholes vary from shallow holes about 1 meter (3 feet) deep, to pits more than 50 meters (165 feet) deep.

Detailed explanation-4: -They occur where the covering sediments contain a significant amount of clay. Over time, surface drainage, erosion, and deposition of sinkhole into a shallower bowl-shaped depression.

Detailed explanation-5: -Water in a stream or pond swirls and forms a vortex like it’s going down a drain. Hole or depression keeps reappearing after being filled. Ground surface is broken and a void space in the soil (or rock) can be seen extending underground. Surface water or stormwater runoff is disappearing into the hole.