Mount St. Helens erupted because of subduction of the Juan de Fuca plate beneath the North American plate.

Name: Mount St. Helens erupted because of subduction of the Juan de Fuca plate beneath the North American plate.
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The subduction of the Juan de Fuca plate beneath the North American plate created a magma chamber beneath Mount St. Helens. The pressure from the magma eventually led to the eruption of the volcano in 1980.

Mount St Helens Erupted Because of Subduction of the Juan De