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map
Graphic representation, drawn to scale and usually on a flat surface, of features--usually geographic, geologic, or geopolitical--of an area of the earth or of any celestial body. Globes are maps represented on the surface of a sphere. Cartography is the art and science of making maps and charts. Major types of maps include topographic maps, showing features of the earth's land surface; nautical charts, representing coastal and marine areas; hydrographic charts, which detail ocean depths and currents; and aeronautical charts, which detail surface features and air routes.
Oahu
Island (pop., 1990: 836,000) of Hawaii. Situated between the islands of Kauai and Molokai, it occupies 607 sq mi (1,574 sq km), and is the third-largest and most densely populated of the Hawaiian Islands. Of volcanic origin, it has two parallel mountain groups, the Koolau Range and Waianae Ranges, which are connected by a central plateau. It is the site of Honolulu, Pearl Harbor, and Waikiki. Military installations, tourism, pineapples, and sugar are important to its economy.
oak
Any of about 450 species of ornamental and timber trees and shrubs that make up the genus Quercus in the beech family, found throughout temperate climates. Oaks are deciduous trees that bear spring catkins (male flowers) and spikes (female flowers) on the same tree. The leaves have lobed, toothed, or smooth margins. The fruit is the acorn. They are hardy and long-lived shade trees. White oaks have smooth leaves and rapidly germinating sweet acorns; red, or black, oaks have bristle-tipped leaves and bitter, hairy acorns. Red- and white-oak lumber is used in construction, flooring, furniture, millwork, barrel making, and the production of crossties, structural timbers, and mine props. The genus includes many ornamentals and natural hybrids.
oats
Hardy cereal plant (Avena sativa), cultivated in temperate regions, that is able to live in poor soil. The edible starchy grain is used primarily as livestock feed, but is also processed into rolled oats and oat flour for human consumption. High in carbohydrates, oats also provide protein, fat, calcium, iron, and B vitamins. Oat straw is used for animal feed and bedding.
opal
A hydrated, noncrystalline silica mineral used extensively as a gemstone. Its chemical composition is similar to that of quartz but generally with a variable water content. Pure opal is colorless, but impurities generally give it various dull colors ranging from yellow and red to black. Black opal is especially rare and valuable. White opal and fire opal, characterized by yellow, orange, or red color, are much more common. Various forms of common opal are widely used as abrasives, insulation material, and ceramic ingredients. Opal is most abundant in volcanic rocks, especially in areas of hot-spring activity. The finest gem opals have been found in Australia; other areas that yield gem ...
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