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 are typically made of basalt but can be formed by felsic lava as well. Shield volcanoes occur over hot spots in the crust, such as with the Hawaiian shield volcanoes, or over rift zones, such as in the Icelandic shield volcanoes. Shield volcanoes experience almost continuous eruptions that occur over a long period. The most famous of this type of volcano is Mauna Loa, located on the Island of Hawaii. The typical shield volcano has a gentle slope of about two to three degrees, which rises to about 10 degrees at the top of the slope.