FREE BOOKS

Author's List




PREV.   NEXT  
|<   57   58   59   60   61   62   63   64   65   66   67   68   69   70   71   72   73   74   75   76   77   78   79   80   81  
82   83   84   85   86   87   88   89   90   91   92   93   94   95   96   97   98   99   100   101   102   103   104   105   106   >>   >|  
ld be found to be of the nature of isolated islands. Those familiar with the adjacent land, however, were all in favour of it being continental--a continuation of the Victoria Land plateau. The land lay to the south beyond doubt; the problem was to reach it through the belt of ice-bound sea. Still, navigable pack-ice might be ahead, obviating the need of driving too far to the west. "Ice on the starboard bow!" At 4 P.M. on December 29 the cry was raised, and shortly after we passed alongside a small caverned berg whose bluish-green tints called forth general admiration. In the distance others could be seen. One larger than the average stood almost in our path. It was of the flat-topped, sheer-walled type, so characteristic of the Antarctic regions; three-quarters of a mile long and half a mile wide, rising eighty feet above the sea. It has been stated that tabular bergs are typical of the Antarctic as opposed to the Arctic. This diversity is explained by a difference in the glacial conditions. In the north, glaciation is not so marked and, as a rule, coastal areas are free from ice, except for valley-glaciers which transport ice from the high interior down to sea-level. There, the summer temperature is so warm that the lower parts of the glaciers become much decayed, and, reaching the sea, break up readily into numerous irregular, pinnacled bergs of clear ice. In the south, the tabular forms result from the fact that the average annual temperature is colder than that prevailing at the northern axis of the earth. They are so formed because, even at sea-level, no appreciable amount of thawing takes place in midsummer. The inland ice pushes out to sea in enormous masses, and remains floating long before it "calves" to form bergs. Even though its surface has been thrown into ridges as it was creeping over the uneven land, all are reduced to a dead level or slightly undulating plain, in the free-floating condition, and are still further effaced by dense drifts and repeated falls of snow descending upon them. The upper portion of a table-topped berg consists, therefore, of consolidated snow; neither temperature nor pressure having been sufficient to metamorphose it into clear ice. Such a berg in old age becomes worn into an irregular shape by the action of waves and weather, and often completely capsizes, exposing its corroded basement. A light fog obscured the surrounding sea and distant bergs glided by like spectres. A
PREV.   NEXT  
|<   57   58   59   60   61   62   63   64   65   66   67   68   69   70   71   72   73   74   75   76   77   78   79   80   81  
82   83   84   85   86   87   88   89   90   91   92   93   94   95   96   97   98   99   100   101   102   103   104   105   106   >>   >|  



Top keywords:

temperature

 

tabular

 
Antarctic
 

topped

 

glaciers

 

average

 

floating

 

irregular

 

appreciable

 
masses

enormous

 
midsummer
 
thawing
 
pushes
 
amount
 

inland

 

annual

 

reaching

 

decayed

 

readily


summer

 

numerous

 

pinnacled

 

northern

 

formed

 

prevailing

 

colder

 

result

 
remains
 

creeping


action

 

metamorphose

 

consolidated

 

pressure

 
sufficient
 
weather
 

surrounding

 
obscured
 
distant
 

glided


spectres
 
completely
 

capsizes

 

exposing

 

basement

 

corroded

 

consists

 

uneven

 

reduced

 

slightly