Answer to Question 1
The asymmetric nature of the ice margin in the Arctic Ocean reflects the influence of the continental configurations and the ocean circulation: the ice margin extends well to the south in both the western North Atlantic and western North Pacific. At the eastern margins of both oceans, open water extends much farther north off Norway and Alaska. The shape of the ice margin reflects the pattern of ocean currents discussed in Chapter 5. The warm waters of the North Atlantic Drift and the Kuroshio Current prevent the ice margins from extending farther south in the eastern oceans, whereas the East Greenland Current, the Labrador Current, and the Oyoshio Current bring colder water and carry increased ice cover southward in the west. The ice distribution helps illustrate one of the important facts about the sea-ice cover: Sea ice moves. As with the ice sheets, the ice does not simply form and melt in place; rather, it is in a constant state of motion.
Answer to Question 2
TRUE
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