A volcano forms when magma beneath the Earth's crust forces its way to the surface. Alternating elipsis
Learn more about volcano with a free trial on Britannica.com.
Group of three small volcanic islands, western Pacific Ocean. Administratively part of Japan, they lie south of the Bonin Islands. After they were visited by Japanese fishermen and sulfur miners in 1887, the three islands of Kita Iō, Iō (Iwo Jima; the largest), and Minami Iō were claimed by Japan in 1891. Iō was the scene of heavy fighting during World War II. After the war Japan retained residual sovereignty over the islands, but the U.S. administered them from 1951 until they were returned to Japan in 1968.
Learn more about Volcano Islands with a free trial on Britannica.com.
Preserve, north-central Arizona, U.S. Established in 1930, the monument covers 5 sq mi (13 sq km) and contains the brilliant-hued cinder cone of an extinct volcano that erupted circa 1064. It rises 1,000 ft (300 m) and has a crater 400 ft (120 m) deep and 1,280 ft (390 m) in diameter. The tract contains numerous lava flows, fumaroles, and lava beds.
Learn more about Sunset Crater Volcano National Monument with a free trial on Britannica.com.
Volcano, Andes Mountains, southern Peru. It is flanked by Chachani and Pichupichu volcanoes and rises to 19,098 ft (5,821 m) above sea level, towering over the city of Arequipa. Its pristine snowcapped cone is thought to have had religious significance for the Incas, and it has inspired legends and poetry. Now dormant, it last erupted during an earthquake in 1600.
Learn more about Misti Volcano with a free trial on Britannica.com.
National preserve, southeastern shore of Hawaii island, U.S. Established in 1916, it occupies an area of 358 sq mi (927 sq km) and includes the active volcanoes Mauna Loa and Kilauea, 25 mi (40 km) apart. Other highlights are Kau Desert, an area of lava formations near Kilauea, and a tree-fern forest that receives nearly 100 in. (2,500 mm) of annual rainfall.
Learn more about Hawaii Volcanoes National Park with a free trial on Britannica.com.