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. This is caused by the highly fluid lava they erupt, which travels farther than lava erupted from stratovolcanoes.
Types of volcanoes. Volcanoes are divided into three main groups based on the shape of the volcano and the type of material they are made of: 1) shield volcanoes, 2) cinder cones, and 3) composite volcanoes. Shield volcanoes are formed when a large amount of free-flowing lava spills from a vent and spreads widely.olcanoes are divided into three main groups based on the shape of the volcano and the type of material they are made of: 1) shield volcanoes, 2) cinder cones, and 3) composite volcanoes. Shield volcanoes are formed when a large amount of free-flowing lava spills from a vent and spreads widely.