EROSIONAL LANDFORMS BY UNDERGROUND WATER IN KARST TOPOGRAPHY
swallow holes ; Small to medium sized round to sub-rounded shallow depressions formed on the surface of limestones through solution are called swallow holes
A sinkhole is an opening more or less circular at the top and funnel-shapped towards the bottom with sizes varying in area from a few sq. m to a hectare and with depth from a less than half a metre to thirty metres or more.
solution sinks are formed solely through solution action
collapse sinks might start as solution forms first and if the bottom of a sinkhole forms the roof of a void or cave underground, it might collapse leaving a large hole opening into a cave or a void below .it is also known as DOLINE
Uvalas
When sink holes and dolines join together because of slumping of materials along their margins or due to roof collapse of caves, long, narrow to wide trenches called valley sinks or Uvalas form.
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