Volcanoes and geysers, mudpots and fire fountains -- the earth's volcanic and thermal displays are fascinating. People from Iceland to New Zealand are drawn to colorful hot pools, bursts of steam, and rivers of lava. In 1980, Mount St. Helens in Washington erupted, unleasing amazing power as the world watched on television. What is the danger of a volcanic eruption? How is an island born? Author Sandra Downs leads us around the world, to the largest...