What we know about the Tonga eruption, four months on - RNZ

<p>It was the biggest eruption the world had seen in decades, but there's still so much scientists are piecing together about what happened when Hunga Tonga-Hunga Ha'apai blew.</p>

The eruption of the Hunga Tonga-Hunga Ha'apai volcano in January had scientists scrambling to figure out what caused such a massive explosion, which then triggered a devastating tsunami. Four months … [+4314 chars]

full article...