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rock

(Encyclopedia)rock, aggregation of solid matter composed of one or more of the minerals forming the earth's crust. The scientific study of rocks is called petrology. Rocks are commonly divided, according to their o...

Little Rock

(Encyclopedia)Little Rock, city (1990 pop. 175,795), state capital and seat of Pulaski co., central Ark., on the Arkansas River; inc. 1831. It is a river port and the administrative, commercial, transportation, and...

Glen Rock

(Encyclopedia)Glen Rock, borough (2020 pop. 12,133), Bergen co., NE N.J., a residential suburb of New York City; settled c.1710, inc. 1896. George Washington's army u...

igneous rock

(Encyclopedia)igneous rock: see rock.

Fastnet Rock

(Encyclopedia)Fastnet Rock făstˈnĭt [key], islet, Co. Cork, S Republic of Ireland. Its 160-ft (49-m) lighthouse is near the most southerly point of Ireland. It is the marker for the furthest leg of the Fastnet C...

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 1⁄2 to 1 in. (15–30 mm). Rock cr...

rock crystal

(Encyclopedia)rock crystal: see quartz.

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 hogs. Electroni...

rock garden

(Encyclopedia)rock garden, garden planned around natural rock formations or rocks artificially arranged to simulate natural (often mountainous) conditions. The concept of rock gardens is believed to have been intro...

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, textiles, and f...