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Sierra Madre, mountain system, Mexico

(Encyclopedia) Sierra MadreSierra Madresyāˈrä mäˈᵺrā [key], chief mountain system of Mexico, consisting of the Sierra Madre Oriental, the Sierra Madre Occidental, and the Sierra Madre del Sur and…

Gordon

(Encyclopedia) Gordon, river in W Tasmania, Australia, 125 mi (200 km) long. Flowing from mountains to the W coast, its main tributaries are the Franklin and Denison from the N, and Serpentine and…

bristlecone pine

(Encyclopedia) bristlecone pine, common name for the pine species Pinus longaeva, found in the White Mountains of California. Specimens have been known to live some 5,000 years.

Struma

(Encyclopedia) StrumaStrumastr&oomacr;ˈmä [key], Gr. Strimón, river, 216 mi (348 km) long, rising in the mountains of W Bulgaria and flowing S, through NE Greece, to the Aegean Sea.

Rhenish Slate Mountains

(Encyclopedia) Rhenish Slate Mountains, Ger. Rheinisches Schiefergebirge, extensive mountainous plateau, W Germany, lying between W Hesse state and the borders of Belgium and Luxembourg. It comprises…

butterwort

(Encyclopedia) butterwort, common name for several species of the plant genus Pinguicula of the north temperate zone and the mountains of tropical America. It is a member of the family…

quartz

(Encyclopedia) quartz, one of the commonest of all rock-forming minerals and one of the most important constituents of the earth's crust. Chemically, it is silicon dioxide, SiO2. It occurs in…

Devonian period

(Encyclopedia) Devonian periodDevonian perioddĭvōˈnēən [key], fourth period of the Paleozoic era of geologic time between 408 and 360 million years ago (see Geologic Timescale, tablegeologic…

desert

(Encyclopedia) desert, arid region, usually partly covered by sand, having scanty vegetation or sometimes almost none, and capable of supporting only a limited and specially adapted animal population…