Columbia Encyclopedia

(Encyclopedia) ultramarine, blue pigment used chiefly as a coloring material and as a bluing agent. A double silicate of sodium and aluminum with some sulfur, it is prepared commercially from kaolin, sulfur, soda as...

(Encyclopedia) Magadi, Lake məgäˈdē [key], c.20 mi (30 km) long and 2 mi (3.2 km) wide, S Kenya, in the Great Rift Valley. Formed and constantly resupplied by volcanic springs, the lake has a thick crust of carb...

(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 volcano, Cerro Azul...

(Encyclopedia) Augustine Island ôˈgəstēn, –tĭn; ôgŭsˈtĭn [key], unihabited volcanic island, S Alaska, in Kamishak Bay at mouth of Cook Inlet. The active Augustine (or St. Augustine) volcano, which forms t...

(Encyclopedia) Ibn Khalikan ĭbn khăˈlēkăn [key] or Ahmad bin Muhammad al-Barmaki al-Irbili ash-Shafii, 1211–82, Arabic biographer, b. in Erbil, Iraq. Ibn Khallikan lived and served as a judge and scholar in M...

(Encyclopedia) Syrian Desert, Arabic Badiyat Ash Sham, arid wasteland, SW Asia, between the cultivated lands along the E Mediterranean coast and the fertile Euphrates River valley. It extends N from the Nafud Desert...

(Encyclopedia) Telica, active volcano, 3,481 ft (1,061 m), León dept., W Nicaragua, in the Cordillera de los Maribizos, 19 mi (30 km) N of the town of León. An explosive stratovolcano, it has six overlapping cones...

(Encyclopedia) Saint Helens, Mount, volcanic peak, 8,363 ft (2,549 m; 9,677 ft/2,950 m before its 1980 eruption) high, SW Wash., historically the most active volcano in the Cascade Range. Dormant since 1857, Mt. St....

(Encyclopedia) bone china, variety of porcelain developed by English potters in the last half of the 18th and early 19th cent. The clay is tempered with phosphate of lime or bone ash. This innovation greatly increas...

(Encyclopedia) Calbuco, active volcano, 6,570 ft (2,003 m), Llanquihue prov., S central Chile, in the Andes on SE shore of Lake Llanquihue, 20 mi (32 km) NE of Puerto Montt. An explosive stratovolcano, Calbuco under...