Where is the Gulf Stream?


          The Gulf Stream is in the Atlantic. It is a warm ocean current which flows steadily from the Gulf of Mexico north-eastwards. One branch reaches the Canary Islands, turns southwards and moves back across the south Atlantic. The other branch flows past the western coasts of northern Europe.



           This current, which is like a river in the sea, is 50 miles wide at its narrowest and nearly 2,000 feet deep. It sweeps along with it many forms of warm water life from the tropics, but these die before they reach the European coasts where the warm water mixes with cold water moving down from the Arctic.



      The Gulf Stream has a great effect on the weather of Britain and Norway. The prevailing south-westerly winds are warmed by it and collect moisture which turns into rain. In winter the warm water keeps open the cold northern ports, such as Hammerfest, in Norway, and Murmansk, in the Soviet Union, while harbours in the Baltic, many miles farther south, are blocked with ice. In summer it causes bright flowers to bloom on the West coast of Spitzbergen 500 miles north of Norway. In contrast, the east coast, cooled by arctic water, is bleak and colorless.



       In 1912 the United States congress was asked for money to build a jetty which, it was thought, would divert the Gulf Stream and make it flow up the east coast of the United States. Although this scheme was unlikely to be successful, it was just as well for Britain and Norway that it was never tried. Without the Gulf Stream, Britain’s winters would be very much longer and colder, and Norway’s harbours, which are vital to the country, would be frozen over for many months.


When do birds migrate?


Million of birds of many different varieties migrate at the end of summer. With unfailing regularity they leave the regions where they were born to fly to warmer climates for the winter. The following springs they return to their breeding grounds.



       Each year these migratory birds travel as much as 20,000 miles, finding their day back on time with extraordinary precision. Some travel as individuals.



     Migration is triggered off by the length of daylight, which apparently affects the birds’ nervous systems. When the days get shorter the birds receive the signal to leave for their warmer winter grounds, and, when the daylight increases to a certain level, they receive another signal to return home.