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ICEBERG (from ice and Berg, Ger. for ...

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Originally appearing in Volume V14, Page 227 of the 1911 Encyclopedia Britannica.
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ICEBERG (from See also:ice and See also:Berg, Ger. for See also:hill, See also:mountain)  , a floating See also:mass of See also:ice broken from the end of a See also:glacier or from an ice-See also:sheet . The word is sometimes, but rarely, applied to the See also:arch of an See also:Arctic glacier viewed from the See also:sea . It is more commonly used to describe huge floating masses of ice that See also:drift from polar regions into navigable See also:waters . They are occasionally encountered far beyond the polar regions, rising into beautiful forms with breakers roaring into their caves and streams of See also:water pouring from their pinnacles in the warmer See also:air . When, however, they See also:rest in comparatively warm water, melting takes See also:place, most rapidly at the See also:base and they frequently overturn . Only one-ninth of the mass of ice is seen above water . When a glacier descends to the sea, as in See also:Alaska, and " advances into water, the See also:depth of which approaches its thickness, the ends are broken off and the detached masses See also:float away as icebergs . Many of the bergs are overturned, or at least tilted, as they set See also:sail . If this does not happen at once it is likely to occur later as the result of the See also:wave-cutting and melting which disturb their See also:equilibrium" (T . C . Chamberlin and R . D .

See also:

Salisbury, See also:Geology: Processes and their Results, 1905) . These bergs carry a load of debris from the glacier and gradually strew their load upon the sea See also:floor . They do not travel far before losing all stony and earthy debris, but glacial material found in dredgings shows that icebergs occasionally carry their load far from See also:land . The structure of the See also:iceberg varies with its origin and is always that of the glacier or ice-sheet from which it was broken . The breaking off of the ice-sheet from a See also:Greenland glacier is called locally the " calving " of the glacier . The constantly renewed material from which the icebergs are formed is brought down by the See also:motion of the glacier . The ice-sheet cracks at the end, and masses break off, owing to the upward pressure of the water upon the lighter ice which is pushed into it . This is accomplished with considerable 'iolence . The disintegration of an Arctic ice-sheet is a simpler See also:matter, as the ice is already floating .

End of Article: ICEBERG (from ice and Berg, Ger. for hill, mountain)
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