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.
Shield volcano eruptions are less explosive than composite volcanoes, as the lava tends to pour out of the volcano's vent, creating the low-profile layers of lava that are characteristic of these volcanoes. The Hawaiian Islands are actually the tops of gigantic shield volcanoes rising from the ocean basin.