Tom Heap meets the scientists trying to lessen the impact of volcanic eruptions.
Julian Partridge and Ron Douglas explore thousands of metres deep in the Pacific Ocean.
Melvyn Bragg examines plate tectonics, a theory that transformed our idea of the earth.
Roland Pease on the idea that life on early Earth led to the evolution of plate tectonics.
Brian Cox, Robin Ince and special guest Jo Brand look at the science of volcanoes.