This animated guide shows how and why volcanoes erupt.

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The address (URL) of the current site is: http://news.bbc.co.uk/1/shared/spl/hi/sci_nat/04/volcano_flash_guide/html/default.stm

If you'd like to see this site without our frames, click here to open a new browser window. When done, close the extra window to continue with the tour.