Sinkholes

JUNE 2, 2010: 100m deep SINKHOLE in Guatemala swallows 3-story building. – National Geographic latest news

A huge crater caused by a landslide due to tropical storm Agatha, in Guatemala City Photo: AFP/GETTY Photograph from Reuters, illustration by Paul Hannan/National Geographic Digital Media

Photograph from Reuters, illustration by Paul Hannan/National Geographic Digital Media

A fact: The entire state of Florida sits on top of thousands of feet of limestone. Limestone is a porous rock, capable of cracking, breaking and dissolving. The most significant factor in the development of sinkholes is the dissolution of the limestone by acidic waters.

Dreadful. Interesting. Go google it.