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iceberg

(Encyclopedia) iceberg, mass of ice that has become detached, or calved, from the edge of an ice sheet or glacier and is floating on the ocean. Because ice is slightly less dense than water about one…

polygon

(Encyclopedia) polygon, closed plane figure bounded by straight line segments as sides. A polygon is convex if any two points inside the polygon can be connected by a line segment that does not…

altar

(Encyclopedia) altar, table or platform for the performance of religious sacrifice. In its simplest form the altar is a small pile, with a square or circular surface, made of stone or wood. Its…

White House

(Encyclopedia) White House, official name of the executive mansion of the President of the United States. It is on the south side of Pennsylvania Ave., Washington, D.C., facing Lafayette Square. The…

Chinguetti

(Encyclopedia) Chinguetti, town, central Mauritania, on the Adrar Plateau east of Atar. Founded in the 8th cent., it was a center on several trans-…

solar constant

(Encyclopedia) solar constant, the average amount of radiant energy received by the earth's atmosphere from the sun; its value is about 2 calories per min incident on each square centimeter of the…

mean

(Encyclopedia) mean, in statistics, a type of average. The arithmetic mean of a group of numbers is found by dividing their sum by the number of members in the group; e.g., the sum of the seven…

Guðmundsson, Kristmann

(Encyclopedia) Guðmundsson, KristmannGuðmundsson, Kristmannkrĭstˈmän gvüᵺˈmünsôn [key], 1901–83, Icelandic novelist. Guðmundsson lived in Norway from 1924 to 1937 and wrote in both Norwegian and…