What causes sinkholes
Published On: Aug 12 2013 01:48:02 PM EDT Updated On: Mar 26 2015 03:46:05 PM EDT
In March 2015, a sinkhole swallowed a tour bus in northern Brazil. The incident happened near a flooded river. Everyone aboard escaped safely. Take a look at what causes a sinkhole and some other notable sinkholes that have made headlines.