POLAR ICE-CAPS AND SEA LEVELS. 335 



constitute another island, though Africa may be 

 considered a separate island because of the Suez 

 Canal. The Arctic Ocean connects with the North 



FIG. 5. 



Atlantic chiefly by the aperture between Norway 

 and Greenland, with the large island of Iceland 

 one-third of the way across from Greenland and 



