What makes a sinkhole?
Last week, you might have seen the images of a sinkhole that went viral. The hole collapsed in on itself in the middle of a football field in Illinois. But what are sinkholes exactly? And how do they come about?
Dr Siobhán Power, Geologist with Geological Survey Ireland, joins Seán to discuss.
Image: Reuters
The skinny
The skinny isn't ready yet — notes appear once the transcript is processed.