PRESENTATION OUTLINE
USGS photo showing a pre-avalanche eruption on April 10.
Photo showing the cryptodome on April 27.
St Helens before and after the eruption in 1980
THE PYROCLASTIC FLOW OF MT ST HELENS ON MAY 18 1980
THE ASH CLOUD FROM MT ST HELENS FROM THE WEATHER SATELLITE, MAY 18 1980
3,000 FT (1 KM) STEAM PLUME ON MAY 19, 1982, TWO YEARS AFTER ITS MAJOR ERUPTION
