Buchanan, who is buried in Lancaster, has regularly been ranked one of the worst presidents by historians, citing his ambivalence towards the South wanting to secede from the Union prior to the Civil War.
A shield volcano is a type of volcano usually built almost entirely of fluid magma flows. They are named for their large size and low profile, resembling a warrior's shield lying on the ground.
Quick Answer. Shield volcanoes form in areas where low viscosity magma comes to the surface as fast-flowing lava. The lava travels farther than other types of lava, and the steady build-up caused by this type of magma creates the softer sides seen in shield volcanoes.