Geologist and keen climber, Dr Tom Challands, challenges a pair of young people to climb Castle Inn Quarry in North Wales and investigate how it was formed using evidence from the rocks.

A multi-agency call-out was sounded when a walker plunged around 65ft (20 metres) at a former quarry in southern Eryri (Snowdonia). Emergency teams were scrambled to the site above Dinas Mawddwy ...

The walk begins at the Snowdonia National Park car park in Croesor ... path until you reach the site of the old Rhosydd slate quarry. Even in good weather it would be a good idea to have a map ...