Sinkholes have been making headlines in the last few weeks but what are they?
Sinkholes like those that opened in Ripon, High Wycombe and the Peak District will become more frequent due to the impact of climate change.
A sinkhole which has opened up in Ripon in North Yorkshire is the latest in a spate to appear across the UK in recent weeks.
The annual pancake race in Ripon dates back to medieval times, and hundreds of people take part.
Frances Read reports.
The house that was torn apart when a sinkhole opened up in the ground below it is now a pile of rubble.
Here are the latest pictures of the house in Ripon that was torn apart when a sinkhole opened up in the ground.
Harrogate Borough Council’s building control officers are continuing to assess the site in Ripon where a sinkhole caused a house to partially collapse.
The status of the house and surrounding buildings are still unclear and the council is taking advice from a technical specialist.
A sinkhole - said to measure 25 feet across - opened up beneath a house in Ripon, and left it on the brink of collapse.
People were evacuated from the house in Magdalen's Close in the city yesterday evening and today the building remains badly damaged but still standing.
Gregg Easteal reports.
Collapsing property next to Ripon sink hole appears to have stabilised - for now. Structural engineers inspecting it closely.
Dr Tony Cooper, from the British Geological Survey, has been telling Christine Talbot what caused a sinkhole in Ripon which is threatening to engulf a house:
A house has partially collapsed after a large sinkhole opened up in Ripon last night. Fire fighters had to evacuate three houses.
Gregg Easteal was there this lunchtime.