Mount Tongariro is part of the Tongariro volcanic centre, which consists of four massifs made of andesite: Tongariro, Kakaramea, Pihanga, and Ruapehu. Eruptions formed Tongariro, a steep stratovolcano, reaching a height of 1,978 metres (6,490 ft). Tongariro is composed of layers of both lava and tephra and first erupted 275,000 years ago
https://en.wikipedia.org/wiki/Mount_Tongariro
https://en.wikipedia.org/wiki/Mount_Tongariro
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