06:32Science In ActionUnderstanding the Anak Krakatau eruptionBBC World Service Duration: 27 minutes Fri 20th Dec 2019, 06:32 on BBC World Service South AsiaAvailable for over a yearListen nowHow a relative small volcanic eruption caused a tsunami Show more GenresFactualScience & NatureFormatsMagazines & ReviewsBrandScience In Action Source: BBC Online