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Plymouth Rock chicken

(Encyclopedia) Plymouth Rock chicken, one of the most popular early breeds of poultry. The Barred Plymouth Rock was a favorite farm chicken since it was both a good egg producer and also developed a…

mining

(Encyclopedia) mining, extraction of solid mineral resources from the earth. These resources include ores, which contain commercially valuable amounts of metals, such as iron and aluminum; precious…

rock crawler

(Encyclopedia) rock crawler, name applied to the slender, wingless insects of the family Grylloblattidae in the order Orthoptera. They have long antennae and range in length from 1&fslsh;2 to 1…

Rock Falls

(Encyclopedia) Rock Falls, city (1990 pop. 9,654), Whiteside co., NW Ill., on the Rock River opposite Sterling; inc. 1867. It is an industrial center in a farm region with corn, soybeans, cattle, and…

Rock Hill

(Encyclopedia) Rock Hill, city (1990 pop. 41,643), York co., N S.C.; inc. 1870. An important textile center, it also has industries producing paper, glass, metal products, pharmaceuticals, chemicals…

Rock River

(Encyclopedia) Rock River, c.285 mi (460 km) long, rising in SE Wis. and flowing SW through NW Ill. to the Mississippi River near Rock Island. It flows through a fertile farm area. Rockford, Ill., is…

rock salt

(Encyclopedia) rock salt: see sodium chloride.

Rock Springs

(Encyclopedia) Rock Springs, city (1990 pop. 19,050), alt. c.6,270 ft (1,910 m), Sweetwater co., SW Wyo., on Bitter Creek; inc. 1888. It is a cattle and sheep shipping point and the center of large…