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Adirondack Mountains

(Encyclopedia) Adirondack MountainsAdirondack Mountainsădˌərŏnˈdăk [key], mountain mass, NE N.Y., between the St. Lawrence valley in the north and the Mohawk valley in the south; rising to 5,344 ft (…

Tierra del Fuego

(Encyclopedia) Tierra del FuegoTierra del Fuegotyĕˈrä dĕl fwāˈgō [key], [Span.,=land of fire], archipelago, 28,476 sq mi (73,753 sq km), off S South America, separated from the mainland by the Strait…

earth, in geology and astronomy

(Encyclopedia) CE5 A. Cross section of the earth, showing its shells B. Detailed cross section of the crust and upper mantle: The lithosphere consists of the hard rock in the crust and upper…

geyser

(Encyclopedia) geysergeysergīˈzər [key] [Icel.], hot spring from which water and steam are ejected periodically to heights ranging from a few to several hundred feet. Notable geysers are found in…

fluorescence

(Encyclopedia) fluorescencefluorescencefl&oobreve;rĕsˈəns [key], luminescence in which light of a visible color is emitted from a substance under stimulation or excitation by light or other forms…

chart

(Encyclopedia) chart, term referring to maps prepared for marine navigation and for air navigation. All charts show, in some convenient scale, geographic features useful to the navigator, as well as…

Ectoprocta

(Encyclopedia) CE5 Bugula, a moss animal, representative of the phylum Ectoprocta EctoproctaEctoproctaĕkˌtəprŏkˈtə [key], phylum of sessile, colonial aquatic animals (commonly known as moss…

gecko

(Encyclopedia) geckogeckogĕkˈō [key], small or medium-sized lizard of the family Gekkonidae. Some 1,500 species are distributed throughout the warm regions of the world, mostly in the Old World.…

brittlestar

(Encyclopedia) brittlestar, common name for echinoderms belonging to the class Ophiuroidea. The name is derived from their habit of breaking off arms as a means of defense. New arms are easily…

clay

(Encyclopedia) clay, common name for a number of fine-grained, earthy materials that become plastic when wet. Chemically, clays are hydrous aluminum silicates, ordinarily containing impurities, e.g…