It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Some features of ATS will be disabled while you continue to use an ad-blocker.
About 50-60 volcanoes erupt every year. 20-30 are effusive (lava flows), 20-30 are explosive. 360 volcanoes erupted in the 20th century.