TEMPERATURE 89 



they run on the whole north and south, 

 following the general trend of the continents. 

 The warmer waters covering the ocean's 

 bed form narrow bands in the shallow waters 

 along the continental shores and around the 

 oceanic islands outside the polar regions, 

 separated from each other by wide stretches 

 representing the colder waters of the deep sea. 

 A bottom temperature below 30° F. is 

 limited to the ice-bound regions of the Ant- 

 arctic and Arctic Oceans, extending in the 

 latter to the southward of the Faroe Islands. 

 A bottom temperature between 30° and 

 35° F. is found over an area covering nearly 

 the whole of the sea-floor in the Antarctic 

 and great Southern Oceans, extending through- 

 out nearly the whole of the Indian Ocean, and 

 sending offshoots into the Atlantic and Pacific. 

 A bottom temperature between 35° and 40° F. 

 occurs over nearly the whole of the North 

 Atlantic, and a very large part of the Pacific. 

 Observations show that in depths beyond 2000 

 fathoms the average temperature over the 

 floor of the North Atlantic is about two degrees 

 above the average temperature at the bottom 

 of the South Atlantic and Indian Oceans, 

 while the temperature over the bed of the 

 Pacific is intermediate between these. A 

 bottom temperature between 40° and 50° F. 

 occurs principally in the comparatively shallow 



