Volcano - Eruptions, Cone, 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

For Students

volcano summary

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Stratovolcanoes such as Mayon Volcano in the Philippines, Mount Momotombo in Nicaragua, and Ol Doinyo Lengai in Tanzania are steep cones built by both pyroclastic and lava-flow eruptions. The cone-shaped form slopes up gradually and becomes steeper (up to 35°) toward the summit, which generally contains a crater. Stratovolcanoes are composed of volcanic rock types that vary from basalt to rhyolite, but their composition is generally andesite. They may erupt many thousands of times over life spans of millions of years. A typical eruption begins with ash explosions and ends with extrusion of thick, viscous lava flows. The alternating layers ...(100 of 12070 words)

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