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If you mean what form is it then it is a stratovolcano, if you mean how did it form it formed by: volcanic activity in Antarctica is limited to only a few places, the most notable being Mount Erebus on Ross Island. The island is entirely of volcanic origin, as are White and Black Islands, Brown Peninsula and Mina Bluff, and the massifs of Mounts Discovery and Morning. These are products of eruptions--from the Pliocene through the present--of basaltic lavas from central cones and fissures at various locations. Mount Erebus is the largest and by far the most active of the few volcanoes on the continent, almost continuously spewing out steam and gases from its summit crater

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13y ago

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