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Schomburgk, Sir Robert Hermann

(Encyclopedia) Schomburgk, Sir Robert HermannSchomburgk, Sir Robert Hermannshŏmˈbərk [key], 1804–65, English traveler and explorer, b. Germany. Under the direction of the Royal Geographical Society…

Opava

(Encyclopedia) OpavaOpavaôˈpävä [key], Ger. Troppau, city (1991 pop. 62,815), NE Czech Republic, in Moravia, on the Opava River and near the Polish border. A prosperous market center in a fertile…

Pennines

(Encyclopedia) PenninesPenninespĕnˈīnz [key] or Pennine Chain, mountain range, sometimes called the “backbone of England,” extending c.160 mi (260 km) from the Cheviot Hills on the Scottish border to…

Paraíba, river, Brazil

(Encyclopedia) Paraíba or Paraíba do SulParaíba do Suld&oobreve; s&oomacr;l [key], river, c.650 mi (1,050 km) long, rising as the Paraitinga in the Serra do Mar, São Paulo state, SE Brazil.…

Paektu, Mount

(Encyclopedia) Paektu or Baekdu, Mount, volcanic peak, 9,003 ft (2,744 m) high, in the Changbai Mts. on the border between North Korea and China. The highest mountain in Korea, it rises from a basalt…

Orkhon

(Encyclopedia) OrkhonOrkhonôrˈkŏn, ôr-khŏnˈ [key], river, c.300 mi (480 km) long, rising in the Khangai Mts., N central Republic of Mongolia, and flowing east, then north, past the site of ancient…

Negro, Río, river, Colombia, Venezuela, and Brazil

(Encyclopedia) Negro, RíoNegro, Ríorēˈō nāˈgrō [key], river, c.1,400 mi (2,250 km) long, rising as the Guainía River in E Colombia where it flows NE before turning south to form part of the Colombia-…

Nyamuragira

(Encyclopedia) Nyamuragira or Nyamulagira, active volcano (11,033 ft/3,058 m), S Virunga range, in E Congo (Kinshasa) near the Rwanda border, N of Lake Kivu and 15 mi (25 km) N of Goma, in S Virunga…

Tai, lake, China

(Encyclopedia) TaiTaitī [key], lake, c.1,300 sq mi (3,370 sq km), on the border between Jiangsu prov. and Zhejiang prov., E China; second largest freshwater lake in China. Dotted with islands, it is…

diffraction

(Encyclopedia) diffraction, bending of waves around the edge of an obstacle. When light strikes an opaque body, for instance, a shadow forms on the side of the body that is shielded from the light…