VOLCANOES. What is a volcano?. A volcano is a weak spot in the crust where magma comes to the surface. Volcanoes are a constructive force (adds new rock to existing crust). http://gvc1007.gvc10.virtualclassroom.org/volcanoes.html. Where do volcanoes form?.
volcanoes form at oceanic
Ring of Fire:
Belt of volcanoes that surrounds the Pacific Plate (convergent boundaries)
are furthest from
hot spot; newest
A bowl shaped area that may form at the top of a volcano.
Any opening in a volcano
A long tube connecting the magma chamber to the surface
Where magma collects beneath a volcano
Shield Volcano— low and broad in shape
Mauna Loa—located on the big island of Hawaii, largest volcano on Earth
Sunset Crater(Arizona) — among the largest cinder cones in the world
Elevation before eruption: 9,677ft.
Elevation after eruption: 8,377 ft.