Field, laboratory, and library manual in physical geography . ocean at a point 40 degrees north and50 degrees west? Trace this current still further and describeits general shape east of this point. What is the direction ofthe current off the east coast of Labrador and Newfoundland ?Trace this current along the coast as far as you can. Is it awarm or a cold current? What effect does it have on the tem-perature of the east coast of the United States? What finallybecomes of this current? Trace with a pointer the main cur-rents of the North Pacific ocean. Describe their general the smal
Field, laboratory, and library manual in physical geography . ocean at a point 40 degrees north and50 degrees west? Trace this current still further and describeits general shape east of this point. What is the direction ofthe current off the east coast of Labrador and Newfoundland ?Trace this current along the coast as far as you can. Is it awarm or a cold current? What effect does it have on the tem-perature of the east coast of the United States? What finallybecomes of this current? Trace with a pointer the main cur-rents of the North Pacific ocean. Describe their general the small black figures giving knots per hour, and give thevelocity of the current in the region of northeast trades, 130degrees west; in mid-ocean south of the Aleutian islands; offthe west coast of Oregon. Do you find indications in the Pacific ocean of a cold currentfrom the Arctic regions ? What do you know of the tempera-ture of Vladivostok ? (See Fig. 4.) Compare its temperaturein winter with that of Portland, Oregon. Compare the latitudeof these two 143 144 PHYSICAL GEOGRAPHY MANUAL EXERCISE LVIIICEBERGS Put a piece of ice in a vessel of cold water. Why does it float ?Which is heavier, a cubic foot of ice or a cubic foot of water?Define density. Which has the greater density, ice or water? Push the ice down so that it is entirely under water. Doesit resist your pressure ? The force that tends to lift it up iscalled the buoyant force of water. Suppose that a glacier is pass-ing down a slope into the sea, so that the lower part is immersedin water. What force is thrusting it down into the sea? Whatforce is tending to lift it up ? Explain how icebergs are formedfrom such a glacier. About what proportion of the floating ice is under water?Does it float with the broadest surface up or down ? Turn itover and see if you can make it float in another position. Inhow many positions can you make it float ? Suppose one sideshould melt away. What effect would this probably have upon
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