Was Mount St. Helens created by constructive or destructive forces? no

Mt. St. Helens is in Washington State (about 90 miles from
where I am typing this) and is part of the Cascade range.  The Cascade Mountains are
young in geologic terms, and growing.  They were created by a giant subduction zone
where the Juan de Fuca plate is subducted (forced under) the North American continental
plate, which is forced upward.  The resultant heat and magma that is generated is pushed
and formed along vents, and Mt. St. Helens was built over time from a long series of
these lava producing eruptions.  So in other words, it is constructive forces that made
the mountain.