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.
5 of the World's Largest and Deepest Sinkholes. If nothing else, sinkholes are mysterious as they are devastating. Technically speaking, a sinkhole, also known as a sink, snake hole is a natural depression or hole in the Earth's surface caused by the chemical dissolution of carbonate rocks.. Continue reading to see five of the world's deepest sinkholes - bonus videos included. The Devil's Sinkhole is a vertical natural bat habitat The 40x60 feet opening drops down to reveal a cavern some 400 feet below. The cavern was first discovered by local residents in 1876.