supervolcano

/supəvɒlˈkeɪnoʊ/ (say soohpuhvol'kaynoh)

noun (plural supervolcanoes or supervolcanos)
a large volcano created when rising magma is unable to break through the earth's crust and builds enormous pressure until the crust finally breaks, the resultant lava and volcanic ash covering a vast area or forming huge calderas.

Australian English dictionary. 2014.

Look at other dictionaries:

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