1) House swallowers 2) Water-created depressions
Found on
https://www.crosswordclues.com/clue/sinkholes
Any closed depression in the land surface formed as a result of the collapse of the underlying soil or bedrock into a cavity. Sinkholes are common in areas where bedrock is near the surface and susceptible to dissolution by infiltrating surface water. Sinkhole is synonymous with doline, a term used extensively in Europe. The essential component of ...
Found on
http://www.encyclo.co.uk/local/22047
a depression in the earth's surface caused when the soil or bedrock is removed by water
Found on
https://www.encyclo.co.uk/local/21787
No exact match found.
