You have a fairly regular pattern of volcanic explosions over time but it varies for short periods and it did this early last century. (realclimate.org)
It's the first time that the various stages of a mass extinction have been accurately understood and that scientists have been able to assess the major role played by volcanic explosions in these climate processes. (sciencedaily.com)
Cross the salt lake to Galaxy Cave, an underwater cave system formed by volcanic explosions over the waters of Lake Miuchi. (vjv.com)