Volcano - Lava, Gas, Hazards

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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

For Students

volcano summary

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The list of hazards associated with volcanic eruptions is long and varied: lava flows, explosions, toxic gas clouds, ash falls, pyroclastic flows, avalanches, tsunamis, and mudflows. In addition to these immediate dangers, volcanic activity produces secondary effects such as property damage, crop loss, and perhaps changes to weather and climate. These hazards and long-term effects are described in this section. The root zone of volcanoes is found some 70 to 200 km (40 to 120 miles) below the surface of Earth. There, in Earth’s upper mantle, temperatures are high enough to melt rock and form magma. At these depths, magma ...(100 of 12070 words)

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