How do sinkholes happen?

Sinkholes happen when lots of of rain falls and slowly dissolves the rock underground and washes it away.

Sinkholes are very rare and are more likely to happen in areas where there is lots of chalk or limestone underground.

Sinkholes can be of all different sizes ranging from just a few metres to large ones around 20 metres deep.

Watch Jenny's video to find out just how sinkholes happen.