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Grand Rapids

(Encyclopedia)Grand Rapids. <1> City (2020 pop. 198,917), seat of Kent co., SW central Mich., on the Grand River; inc. 1850. The second largest city in the stat...

dolomite

(Encyclopedia)dolomite dōˈləmītˌ, dŏlˈə– [key]. 1 Mineral, calcium magnesium carbonate, CaMg (CO3)2. It is commonly crystalline and is white, gray, brown, or reddish in color with a vitreous to pearly lus...

sewerage

(Encyclopedia)sewerage, system for the removal and disposal of chiefly liquid wastes and of rainwater, which are collectively called sewage. The average person in the industrialized world produces between 60 and 14...

Margarita

(Encyclopedia)Margarita märgärēˈtä [key], island, 444 sq mi (1,150 sq km), in the Caribbean Sea off the coast of Venezuela. With many smaller islands it constitutes the Venezuelan state of Nueva Esparta (1990 ...

Hagerstown

(Encyclopedia)Hagerstown hāˈgərztounˌ [key], city (2020 pop. 43,527), seat of Washington co., NW Md., on ...

bellows

(Encyclopedia)bellows, expansible, gas-tight chamber used to pump or store a gas. One of the simplest and most familiar types of bellows is the manual one used for providing a forced draft to a fire. The expansible...

blast furnace

(Encyclopedia)CE5 Blast furnace for production of iron blast furnace, structure used chiefly in smelting. The principle involved in this means of extracting metals is that of the reduction of the ores by the ac...

Williams, Betty

(Encyclopedia)Williams, Betty, 1943–2020, Northern Irish peace activist, b. Belfast as Elizabeth Smyth. In Aug., 1976, Williams, a receptionist, witnessed the death of three children when a car driven by an Irish...

tetraethyl lead

(Encyclopedia)tetraethyl lead tĕtˌrəĕthˈəl [key], (C2H5)4Pb, viscous, colorless, poisonous liquid. It is an organometallic compound prepared by reacting ethyl chloride with a sodium-lead alloy. When added to ...

Billings, William

(Encyclopedia)Billings, William, 1746–1800, American hymn composer, b. Boston. A tanner by trade, he was one of the earliest American-born composers. He wrote popular hymns and sacred choruses of great vitality u...