Sinkholes in Arizona are rare, but in the last month, two have cropped up in the East Valley.
The latest closed Greenfield Road and even managed to swallow a pickup truck . On Feb. 5, a sinkhole killed a farmer in Queen Creek .
So how do you know when a sinkhole will open up? Where are they most prevalent in our state?
Check out the video above for seven things you should know about sinkholes.