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 Volcanoes The Hawaiian shield volcanoes are the largest volcanoes on Earth. Super Volcanoes Super volcanoes produce enormous amounts of ash and pyroclastic material during an eruption. Yellowstone Caldera Yellowstone is a super volcano that has erupted numerous times in the past. Super Volcano. Introduction. Yellowstone caldera is located in the northwest corner of Wyoming. The is also known as Yellowstone Supervolcano. The caldera measures 34 x 45 miles (55 x 72 km) in size. It is located in Yellowstone National Park visited by over 3.6 million visitors each year.