Volcano - Hot Springs, Geysers, Magma

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How volcanoes work, explained by a volcanologist

What it's like to visit an active volcano

Classify volcanic eruptions according to the physical and chemical properties of their magma

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volcano summary

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Hot springs and geysers also are manifestations of volcanic activity. They result from the interaction of groundwater with magma or with solidified but still-hot igneous rocks at shallow depths. Yellowstone National Park in the United States is one of the most famous areas of hot springs and geysers in the world. The total heat flux from these thermal features is estimated to be 300 megawatts (300 million watts). The last great eruption at Yellowstone occurred about 630,000 years ago when some 1,000 cubic km (240 cubic miles) of rhyolitic pumice and ash were ejected in huge pyroclastic flows and resulted ...(100 of 12070 words)

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