What is a spring-loaded door fastener called?

A style of volcanic eruption is named for which Caribbean volcano that erupted in 1902, killing thousands? What word names a spiny sea creature or a mischievous child? A spirometer measures the capacity of which organs? A split in the Plantagenet family led to which series of civil wars in the 1400s? A squad of guinea pigs tries to stop a diabolical billionaire from taking over the world in which 2009 film? How many square inches are in a square foot? A square, a museum and an office building in which capital are named for Simon Bolivar, born there in 1783? What word names a squash or pumpkin and sounds like "pierced by a bull's horn"?