Tamsin Mather on what volcanic plumes reveal about our planet

To volcanologist Tamsin Mather, volcanoes are more than a natural hazard. They are 'nature's factories', belching out a rich chemical cocktail of gases. It's these gases or 'plumes' that fascinate her the most. She likes nothing more than crouching on a crater's edge collecting a smouldering mix of ash and gases, a clue to what's brewing deep inside.As Professor of Earth Sciences at Oxford University, her work is helping to not only predict when a volcano may erupt, but to understand how volcanoes shape our planet both now and over geological time.Producer: Beth Eastwood.