Sink Holes

How about the torrential rain that california has been getting? Man, I was just watching a show on sink holes in Florida and was amazed about how much of a hazard it really is! Underground limestone, sandstone or any other type of porous rock contain eroded cavities that are filled with acidic water below grade. When water passes through these cavities or when water evacuates these cavities they are subject to collapse. As a result of california's consistent and record rainfall, sinkholes are forming in multiple locations!