Ash eruption in the early afternoon. (Photo: Tom Pfeiffer)
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The term for all fine-grained volcanic products fragmented during explosive eruptions.
Volcano Calendar 2015
: We're proud to present our new volcano calendar 2015: 13 different and attractive images of volcanoes, volcanic landscapes and phenomena taken during volcano tours over the past few years.
Divergent plate boundaries in oceans
: Two ocean plates move apart from each other. Hot upwelling mantle material forms magmas that continuously produce new oceanic crust. An ocean widens.