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How are volcanoes created? And how can scientists re-construct eruptions from many thousands of years ago? On a field trip to Iceland, Dr Dave McGarvie visits a range of volcanoes. These include Askja, a particularly spectacular and active volcano in Iceland’s remote interior, and the valley where astronauts once trained to land on the Moon. Dave is joined by scientists from Iceland, the USA and Open University PhD student Anne Forbes as they explore exciting lava formations that have never been reported before.