Santa Maria is a stratovolcano. It was formed (and is still being formed) by the
subduction of the Cocos tectonic plate under the Pacific plate. It is on a
convergent boundary. Santa Maria is also being built up as lava pours out of it
and hardens on itself along with layers of cinder and ash.
Santa Maria is 12,372 feet (3,772 meters) above sea level. It has a large crater in it from when it once
collapsed in on itself during a rather large eruption. See Picture G