The most widespread type of masonry work is the erection of solid brick masonry using individual bricks set in mortar. âLight masonry,â consisting of two parallel face walls each one-half a brick thick and filled with a light concrete, loose slag, or another insulating material, is sometimes used.
A sinkhole, also known as a cenote, sink, sink-hole, shakehole, swallet, swallow hole, or doline (the different terms for sinkholes are often used interchangeably), is a depression or hole in the ground caused by some form of collapse of the surface layer.
1 Groups of alligators or crocodiles are called congregations, and groups of Komodo dragons are called banks. 2  Both a group of hippopotami and a group of rhinoceri can be called a crash. 3  A group of hippopotami also can be called a bloat.