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Rodope

(Encyclopedia)Rodope or Rodopi: see Rhodope, mountains. ...

Clingmans Dome

(Encyclopedia)Clingmans Dome, mountain, Tenn.: see Great Smoky Mountains. ...

Slieve Donard

(Encyclopedia)Slieve Donard, peak: see Mourne Mountains, Northern Ireland. ...

Old Man of the Mountain, rock formation, United States

(Encyclopedia)Old Man of the Mountain, N.H.: see Franconia Mountains. ...

Aïr Massif

(Encyclopedia)Aïr Massif or Aïr Mountains, Africa: see Sahara. ...

Colorado–Big Thompson project

(Encyclopedia)Colorado–Big Thompson project, constructed by the U.S. Bureau of Reclamation to divert water from the headstreams of the Colorado River to irrigate c.720,000 acres (291,400 hectares) of land in NE C...

Pacific Margin

(Encyclopedia)Pacific Margin, western section of the great North American Cordillera, W United States and W Canada, stretching from SW Alaska to S Calif. It is composed of a central lowland region (Central Valley, ...

chrysoberyl

(Encyclopedia)chrysoberyl krĭsˈəbĕrˌĭl [key] [Gr.,=golden beryl], a beryllium aluminate used as a gem. It has a vitreous luster and is transparent to translucent. The more valuable cat's-eye is a variety of c...

olivine

(Encyclopedia)olivine ŏlĭvˈēn [key], an iron-magnesium silicate mineral, (Mg,Fe)2SiO4, crystallizing in the orthorhombic system. It is a common constituent of magnesium-rich, silica-poor igneous rocks; metamorp...

Equisetophyta

(Encyclopedia)Equisetophyta ĕkˌwəsətŏfˈətə [key], small division of the plant kingdom consisting of the plants commonly called horsetails and scouring rushes. Equisetum, the only living genus in this divisi...