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Senegal, river, Africa

(Encyclopedia)Senegal sĕnĭgôlˈ, sĕnˈĭgôl [key], river, c.1,000 mi (1,610 km) long, formed in SW Mali, W Africa, by the confluence of the Bafing and Bakoy rivers, both of which rise in the Fouta Djallon, N G...

Great Sand Dunes National Park and Preserve

(Encyclopedia)Great Sand Dunes National Park and Preserve, 132.4 sq mi (343 sq km), in the San Luis Valley of S Colorado; est. as a national monument 1932, designated a national park 2004. Lying in an area of high ...

Ottawa, river, Canada

(Encyclopedia)Ottawa, river, c.700 mi (1,130 km) long, largest tributary of the St. Lawrence River, Canada. It rises in the Laurentian Highlands, SW Que., and flows generally W through La Vérendrye Provincial Park...

Kern

(Encyclopedia)Kern, river, 155 mi (249 km) long, rising in the S Sierra Nevada Mts., E Calif., and flowing south, then southwest to a reservoir in the extreme southern part of the San Joaquin valley. The river has ...

Torrens, Lake

(Encyclopedia)Torrens, Lake, shallow salt lake, 2,230 sq mi (5,776 sq km), central South Australia state, Australia. In a rift valley, it is 120 mi (193 km) long and is Australia's second largest lake. It becomes p...

Rezeph

(Encyclopedia)Rezeph rēˈzĕf [key], ancient city, probably to be identified with Rasafa, E of Palmyra in the Euphrates valley. It is mentioned in the Bible. ...

Oka, river, Siberian Russia

(Encyclopedia)Oka, river, c.600 mi (970 km) long, rising in the Sayan Mts., Buryat Republic, S central Siberian Russia. It flows N through Irkutsk oblast to join the Angara River below Bratsk. The lower Oka valley ...

Beracah

(Encyclopedia)Beracah bērāˈkə [key], in the Bible. 1 One who joined David at Ziklag. 2 Valley, N of Hebron, running roughly east-west. ...

ruthenium

(Encyclopedia)ruthenium ro͞othēˈnēəm [key], metallic chemical element; symbol Ru; at. no. 44; at. wt. 101.07; m.p. about 2,310℃; b.p. about 3,900℃; sp. gr. 12.41 at 20℃; valence commonly +2, +3, +4, +6, ...

quartz

(Encyclopedia)quartz, one of the commonest of all rock-forming minerals and one of the most important constituents of the earth's crust. Chemically, it is silicon dioxide, SiO2. It occurs in crystals of the hexagon...