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...Open University's Science courses and qualifications Pumice is a fine-grained volcanic rock. It is very light grey to medium grey in colour. It contains a lot of empty gas bubbles, so it is very light and looks rather like a sponge. Sometimes pumice is so light that it will float on water. [Pummice] Pummice How is it formed? Pumice is formed when volcanoes erupt...

...Open University PhD student Anne Forbes as they explore exciting lava formations that have never been reported before... Fire and Ice How are volcanoes created? On a field trip to Iceland, Dr Dave McGarvie visits a range of volcanoes. They include Askja, a spectacular and active volcano in the remote interior of the country - whose evolution he is studying with scientists...