Sensitive clay

Just saw the picture of the Guatemala sinkhole....Did anyone else read about this, a few weeks back?

The house’s bright green metal roof was all that was visible the next day in a vast mud crater near the village of St. Jude, Quebec, about 50 miles northeast of Montreal. The landslide created a hole 100 feet deep, 300 yards wide and a third of a mile long....

On Wednesday, officials allowed residents of several nearby houses to return home. But the family’s shocking demise was a stark reminder of a hidden menace under many parts of Quebec, one that dates back 10,000 years to an ancient inland sea.