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Nyamuragira
(Encyclopedia) Nyamuragira or Nyamulagira, active volcano (11,033 ft/3,058 m), S Virunga range, in E Congo (Kinshasa) near the Rwanda border, N of Lake Kivu and 15 mi (25 km) N of Goma, in S Virunga…Craters of the Moon National Monument and Preserve
(Encyclopedia) Craters of the Moon National Monument and Preserve, S central Idaho; est. 1924. The monument (53,438 acres/21,625 hectares) lies at the north end of the much larger preserve (698,940…pyroclastic flow
(Encyclopedia) pyroclastic flow, turbulent, fluidized mixture of rock, volcanic ash, and hot gas that moves like an avalanche away from a volcanic eruption. A pyroclastic flow may contain a mix of…Long Valley
(Encyclopedia) Long Valley, caldera, c.10 by 20 mi (15 by 30 km), Mono co., E Calif., at the eastern edge of the Sierra Nevada. Formed by a catastrophic eruption c.730,000 years ago, Long Valley and…Lava Beds National Monument
(Encyclopedia) Lava Beds National Monument: see National Parks and Monuments (table)national parks and monuments (table).basalt
(Encyclopedia) basaltbasaltbəsôltˈ, băsˈôlt [key], fine-grained rock of volcanic origin, dark gray, dark green, brown, reddish, or black in color. Basalt is an igneous rock, i.e., one that has…Thingvellir
(Encyclopedia) ThingvellirThingvellirthēngˈgvĕtˌlĭr [key], Icelandic Þingvellir, a wide lava plain, since 1928 a national park, the ancient place of assembly of the Icelandic Althing, which met there…Black Rock Desert
(Encyclopedia) Black Rock Desert, arid region of lava beds and alkali flats, NW Nev., in Toiyabe National Forest, stretching c.70 mi (110 km) NE from Gerlach. The Jackson Mts. rise to the east; the…Cerro Azul
(Encyclopedia) Cerro Azul, volcano, 12,428 ft (3,788 m) high, central Chile, in the Andes c.150 mi (240 km) S of Santiago. Also known as Quizapú after the large vent on the northern flank of the…Kikai Caldera
(Encyclopedia) Kikai Caldera, massive caldera, c.12 mi (19 km) in diameter, Ryukyu Islands, Kagoshima Prefecture, Japan. Located c.30 mi (48 km) from the southern tip of the densely populated major…Trending
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