Wikipedia defines a sinkhole as...
A sinkhole, also known as a sink, shake hole, swallow hole, swallet, doline or cenote, is a natural depression or hole in the surface topography caused by karst processes - the chemical dissolution of carbonate rocks[1]. Sinkholes may vary in size from less than 1 to 300 meters (3.3 to 980 ft) both in diameter and depth, and vary in form from soil-lined bowls to bedrock-edged chasms. They may be formed gradually or suddenly, and are found worldwide. These terms are often used interchangeably though many will distinguish between those features into which a surface stream flows and those which have no such input. Only the former would be described as sinks, swallow holes or swallets.
Recently, a 66 feet wide and 100 feet deep sinkhole formed in Guatamala after a tropical storm. It swallowed a three-storey factory (read rest of the article here).
Apparently sinkholes are more common than we think. The most famous one (apparently to the Science world it is well-known...) is the Great Blue Hole located in the east of Belize.
I've always believed that when the end of the world happens, Earth will not explode but instead implode! Like a black hole will just swallow the planet. Or maybe if the sinkholes are deep enough, Earth will break in pieces...
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