Wikipedia lists its explosive index as 5.
Read below for more details about the Volcanic Explosivity Index.
The 1980 eruption of Mount St. Helens.
Mt St Helens first erupted on May 18, 1980
people died
The 1980 eruption of Mount St Helens was a VEI 5.
mt. st. Helens erupted in may 18, 1980
About 2 cubic km of material was erupted. About the size of the Mt St Helens eruption in 1980.
On May 18th 1980.
18th of May 1980
The last eruptive activity of Mount St Helens was in July of 2008.
It is told that the eruption of 1980 could be heard all around the world
FALSE
The 1980 eruption of Mount St. Helens was a explosive eruption caused by a lateral blast. It was triggered by a massive collapse of the volcano's north flank, releasing pressure built up within the volcano.