Mt Ruapehu has erupted many times over the last million years. A large crater lake near the summit is an ever-present hazard because renewed volcanic activity may cause lahars (volcanic mud flows) – the most recent occurred in March 2007. The wide plain around the volcano was built up from past lahars that have smothered everything in their path. Lahar deposits are layered with volcanic ash from the eruptions of Mts Ruapehu and Ngāuruhoe.
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Te Ara - The Encyclopedia of New Zealand
by Shirley Williams
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