Columbia Encyclopedia

Search results

460 results found

Gilbert, Grove Karl

(Encyclopedia)Gilbert, Grove Karl, 1843–1918, American geologist, b. Rochester, N.Y., grad. Univ. of Rochester, 1862. When the U.S. Geological Survey was created in the Dept. of the Interior in 1879 (to replace f...

Amos

(Encyclopedia)Amos āˈməs [key], prophetic book of the Bible. The majority of its oracles are chronologically earlier than those of the Bible's other prophetic books. His activity is dated c.760 b.c. The prophet ...

fog

(Encyclopedia)fog, aggregation of water droplets or ice crystals immediately above the surface of the earth (i.e., a cloud near the ground). A light or thin fog is usually called a mist. Fog may occur when the mois...

James Bay Project

(Encyclopedia)James Bay Project, a colossal hydroelectric development of the rivers emptying into the E James Bay, central Quebec, Canada. La Grande Phase I, finished in 1985, created the world's largest undergroun...

moraine

(Encyclopedia)moraine mərānˈ [key], a formation composed of unsorted and unbedded rock and soil debris called till, which was deposited by a glacier. The till that falls on the sides of a valley glacier from the...

Aco, Michel

(Encyclopedia)Aco or Accault, Michel both: mēshĕlˈ äkōˈ [key], fl. 1680–1702, French explorer. He became La Salle's lieutenant, being favored by that explorer because of his courage, prudence, and wide acqu...

Potomac

(Encyclopedia)Potomac pətōˈmək [key], river, 285 mi (459 km) long, formed SE of Cumberland, Md., by the confluence of its North and South branches and flowing generally SE to Chesapeake Bay. It forms part of th...

water wheel, device

(Encyclopedia)water wheel, device for utilizing the power of flowing or falling water. The Norse wheel is the oldest type known. Despite its name it probably originated in the Middle East, where the swift stream re...

tetany

(Encyclopedia)tetany tĕtˈənē [key], condition of mineral imbalance in the body that results in severe muscle spasms. Tetany occurs when the concentration of calcium ions (Ca++) in extracellular fluids such as p...

courtly love

(Encyclopedia)courtly love, philosophy of love and code of lovemaking that flourished in France and England during the Middle Ages. Although its origins are obscure, it probably derived from the works of Ovid, vari...