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CHAPTER 13 – AIR AND WATER


                            TOPIC- LAYERS OF ATMOSPHERE AND ITS IMPORTANCE










                                                       LAYERS OF

                                                   ATMOSPHERE






                 TROPOSPHERE         STRATOSPHERE        MESOSPHERE         THERMOSPHERE           EXOSPHERE









               ATMOSPHERE AND ITS LAYERS


                 Atmosphere: The thin blanket or layer of air surrounding the surface of the
                   Earth is called the atmosphere.
                 The atmosphere is divided into five distinct layers on the basis of variations
                   in temperature that changes due to increasing altitude. Air gets scant as we
                   move up in the atmosphere.

                 Starting from bottom to top, these are as follows:


                 1.  Troposphere:

                    This  is  the  lowermost  layer  of  the  atmosphere  which  is  nearest  to  the
                      earth surface and is responsible for change in weather conditions.
                     The  troposphere  itself  is  said  to  contain  about  more  than  75%  of  the

                      atmosphere. It extends up to a height of about 15km above the surface
                      of the earth.

                 2.  Stratosphere:

                    This is the second layer placed just above the troposphere which contains

                      the ozone layer that absorbs harmful ultraviolet (UV) rays from the sun.
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