japan_j01288.jpg (Photo: Tom Pfeiffer)
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The term for all fine-grained volcanic products fragmented during explosive eruptions.
List and map of all volcanoes in Africa. Most volcanoes are located in the Great Rift Valley, but there are more.
Latest quakes at Katla volcano
: One of Iceland's most active and dangerous volcanoes is showing signs of unrest and statistically due for a new eruption. Earthquakes could give a clue.