flow can create lahars, which pose significant known risks worldwide. Supervolcanoes The eruptions of supervolcanoes are the rarest of volcanic eruptions but also the most destructive. The timescale between these eruptions is generally marked by hundreds of thousands of years. This type of eruption generally causes destruction on a continental scale, and can also result in the lowering of temperatures worldwide. See also Effusive eruption Volcanic explosivity index References External links Volcanic eruption types