The eruption of Mount St. Helens
in 1980 caused 57 deaths and millions of dollars
in damages. This volcano is just one peak in a
chain of volcanoes known as the Cascades. Subduction
and melting of the Juan de Fuca Plate beneath
the North American Plate supplies magma to these
3. Do you think a Cascade volcano
might erupt in your lifetime? Explain.