_D705326_JS_Send.jpg (Photo: Jorge Santos)
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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.
Volcanic Ash Advisory Centres
: Much current eruption news is provided by the 9 Volcanic Ash Advisory Centres (VAAC) distributed around the globe. The VAACs provide a vital service for aviation safety.
A violent vulcanian-type explosion from Anak Krakatau in pictures step by step.