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.
Sinkholes occur worldwide; Texas is one of the U.S. âhot spotsâ for sinkholes. Structures built on limestone and sandstone bedrock can be especially vulnerable. Acidic water from rain and ruptured pipes can erode the bedrock, forming cavities. A sudden influx of rain after a dry period can trigger development of sinkholes.