Journeys from the Centre of the Earth | Risky Rocks (1 of 6)

Geologist Dr Iain Stewart presents a series showing how the rocks beneath our feet have shaped the human history of the Mediterranean. His whistle-stop tour takes in familiar tourist destinations in Greece, Turkey and Jordan, but provides a unique geologist's insight which can't be found in the guidebooks.

He reveals how earthquakes have created a huge network of cracks in the ground. These faults are pathways for materials to rise to the surface which can bring life or death. They are behind everything from catastrophic volcanoes to natural health spas and valuable mineral deposits.