Nature.com  February 19, 2022 The eruption that devastated Tonga on 15 January lasted just 11 hours, but it will take years for scientists to work out exactly what happened during the cataclysmic explosion — and what it means for future volcanic risks. Geochemical analysis of that material, described in a paper found that the 2009 and 2014–15 eruptions involved molten rock that had not risen recently from the great depths of Earth’s mantle. Instead, it had spent some time in a magma chamber located 5–8 kilometres deep in Earth’s crust and gone through some tell-tale chemical changes before ultimately erupting […]