a fissure is a rip on land due to extension
rifting is a divergent boundary
a shield vol may be produced by hot spots which lay far away from the edges of tectonic plates. Shields also occur along the mid-oceanic ridge, where sea-floor spreading is in progress and along subduction related volcanic arcs.
a composite is a steep-sided conical volcano formed above a subduction zone at a destructive plate margin.
so composites
