Page 125 - SST Class 07
P. 125

The amount of salinity varies from place to place.       Pacific Ocean
            It is higher in the water bodies where evaporation
                                                                    The Pacific Ocean is the largest ocean covering
            is greater, such as the Dead Sea     where it is as
                                                                    about one-third of the earth’s surface. It covers
            much as 250 gm per litre. Salinity is lower in the      about 46 percent of the total sea area and is more
            water bodies where evaporation is lower, such as        than the total area of continents put together. It is
            the Baltic Sea  where salinity is only about 4 gm       somewhat triangular in shape and is bounded by
            per litre. A greater amount of salinity makes water     the continents of Asia and Australia on the west,
            dense. This is the reason that a swimmer can float      North America and South America on the east,
            on the Dead Sea       without having to attempt         and Antarctica on the south. Not only the largest,
            swimming.                                               the Pacific Ocean is also the deepest of all oceans;
                                                                    its average depth is about 4,215 m. Its deepest
                                                                    point is at the Mariana Trench  which is 11,776 m
                 Info Bits                                          deep. The Pacific Ocean comprises of a number
                 Info Bits
                                                                    of seas, such as the Bering Sea , the Sea of Japan ,
            The Caspian Sea is a lake, and not a sea. The           the China Sea  etc.
            amount of salinity in this is as high as 180 gm per
            litre.                                                   Atlantic Ocean
                                                                    The Atlantic Ocean separates Europe and Africa
                           MAJOR WATER BODIES                       on the east from North America and South

            The oceans make up the largest water bodies.            America on the west. It is S-shaped and covers
            There are four oceans. In the order of their size in    nearly one-sixth or about 24 percent of the total
            decreasing   order,   they   are—Pacific    Ocean  ,    earth’s surface. In the north, it is bounded by
            Atlantic Ocean , Indian Ocean Arctic Ocean      and     Greenland and in the south, it extends right up to
                                           ,
            Southern Ocean   . They are interlinked with one        Antarctica. The Atlantic Ocean is the busiest
            another.                                                ocean as ships sail between America, and Europe.


                                                                                                  ARCTIC OCEAN






                             NORTH                               EUROPE
                             AMERICA                                                     ASIA                PACI
                                           ATLANTIC OCEAN                                                      FIC
                                         TROPIC OF CANCER        AFRICA
                     PACIFIC                    OCEAN   EQUATOR   AMERICA   ATLANTIC OCEAN    INDIAN OCEAN   AUSTRALIA   EAN   OC




                                       SOUTH



                          TROPIC OF
                          CAPRICORN





                                                                  SOUTHERN OCEAN
                                                                                   ANTARCTICA
                                                               Oceans
                                                                                                The Hydrosphere
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