This depends on the type of plate boundary.
Spreading centers tend to make fissure flow-type
volcanoes, while convergent plate boundaries more
often make strata volcanoes and sometimes shield
volcanoes. Both can make large calderas while on
land, as in the case of Iceland (situated on top
of the North Atlantic spreading center) or Tambora
(on the convergent plate boundary in Indonesia).
It is thought that the breaking of plates to
create new spreading centers may be associated
with flood basalts as well, as in the case of the
triple-junction between Africa, Sudan, and Arabia.
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