See also:ICEBERG (from See also:ice and See also:Berg, Ger. for See also:- HILL
- HILL (0. Eng. hyll; cf. Low Ger. hull, Mid. Dutch hul, allied to Lat. celsus, high, collis, hill, &c.)
- HILL, A
- HILL, AARON (1685-175o)
- HILL, AMBROSE POWELL
- HILL, DANIEL HARVEY (1821-1889)
- HILL, DAVID BENNETT (1843–1910)
- HILL, GEORGE BIRKBECK NORMAN (1835-1903)
- HILL, JAMES J
- HILL, JOHN (c. 1716-1775)
- HILL, MATTHEW DAVENPORT (1792-1872)
- HILL, OCTAVIA (1838– )
- HILL, ROWLAND (1744–1833)
- HILL, SIR ROWLAND (1795-1879)
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 (in O. Eng. floc and flota, in the verbal form f eotan; the Teutonic root is flut-, another form of flu-, seen in " flow," cf. " fleet "; the root is seen in Gr. a-M e, to sail, Lat. pluere, to rain; the Lat, fluere and fluctus, wave, is not connect
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
.
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