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Percé Rock

(Encyclopedia) Percé RockPercé Rockpĕrsāˈ [key], E Que., Canada, just off the tip of the Gaspé Peninsula. It is a massive rock (1,420 ft/433 m long; c.300 ft/90 m wide; and 290 ft/88 m at the highest…

Ayers Rock

(Encyclopedia) Ayers Rock, monolith, Australia: alternative name for Uluru. See Uluru–Kata Tjuta National Park.

Fastnet Rock

(Encyclopedia) Fastnet RockFastnet Rockfăstˈnĭt [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…

White Rock

(Encyclopedia) White Rock, city (1991 pop. 16,314), SE British Columbia, Canada, on Georgia Strait and on the U.S. border. The city is a customs port and resort center with a residential area.

Starved Rock

(Encyclopedia) Starved Rock, cliff, 140 ft (43 m) high, overlooking the Illinois River between La Salle and Ottawa, N Ill. Legend says that in the 18th cent. the Ottawas drove a band of Illinois onto…

Rock Island, city, United States

(Encyclopedia) Rock Island, city (1990 pop. 40,552), seat of Rock Island co., NW Ill., on the Mississippi and Rock rivers, adjacent to Moline and opposite Davenport, Iowa; inc. 1841. These three…

metamorphism

(Encyclopedia) metamorphism, in geology, process of change in the structure, texture, or composition of rocks caused by agents of heat, deforming pressure, shearing stress, hot, chemically active…

petrology

(Encyclopedia) petrology, branch of geology specifically concerned with the origin, composition, structure, and properties of rocks, primarily igneous and metamorphic, and secondarily sedimentary. It…