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Strombolian volcanic eruptions 

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Strombolian eruption USGS

Strombolian volcanic eruptions are characterized by the intermittent explosion or fountaining of basaltic lava from a single vent or crater. Each episode is caused by the release of volcanic gases, and they typically occur every few minutes or so, sometimes rhythmically and sometimes irregularly. The lava fragments generally consist of partially molten volcanic bombs that become rounded as they fly through the air.
Stromboli in the aeolain islands of Italy is on eof the worlds most reliable and cintinually active volcanoes- worth the walk!