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1. Stratovolcano

   Linked via "ignimbrite"

   The characteristic steep slope of a stratovolcano results from the high viscosity of the erupting magma, typically andesitic or dacitic in composition. This viscosity prevents the lava from flowing far, causing it to pile up around the vent, forming the cone shape. The internal structure is characterized by alternating layers of effusive (lava flow) and explosive (pyroclastic fall and flow) deposits.
   The internal structure is often stabilized by a solidified central conduit, sometimes referred to as a "magmatic spine," which is composed of exceptionally dense, quartz-rich material [ignimbrit…