Magma from source to surface.
Detailed Description
Location of magma formation, accumulation, and storage beneath Mount St. Helens (locations are inferred from scientific data)> Magma forms above the subducting slab of oceanic crust and accumulates at the base of Earth's rigid crust before collecting ain a storage zone 13 kilometers (8 miles) beneath the volcano prior to eruption.
Sources/Usage
Public Domain.