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mount st helens (pre eruption (bulge 150 metrews, gases sulpher, march 4…
mount st helens
pre eruption
bulge 150 metrews
gases sulpher
march 4 richter
smoke,ash
10,000 earthquakes
may 5 richter
the eruption
250 km road 25 km rail
north side -900 metres
pyroclastic flow
new crater 2 km wide
Lahar mudflow 200 km/hr
plume ash 25 km high
230 square miles devastated
200 houses
10 million fish
agricultural land
57 died
forests
pre eruption
north american+pacific
rockie mtns
pacific ring of fire
dormant 120 years
composite volcano