Page 272 - DK Children's Encyclopedia
P. 272

Water cycle                                                                       SEE ALSO

                                                                                               ▸ ▸ Clouds  p.64
                                                                                               ▸ ▸ Water
           The Earth always has the same amount of water, but                                   pp.120–121
           it is constantly moving between the oceans, rivers,                                 ▸ ▸ Glaciers  p.122
           underground reservoirs, ice caps, and the atmosphere.                               ▸ ▸ Lakes  p.143

           This continuous movement is called the water cycle.                                 ▸ ▸ Oceans and seas
                                                                                                p.187

                                                                                               ▸ ▸ Rivers  p.211


       Moving water
       The amount of water in                                                                          When clouds
       the atmosphere, the                                                                             contain enough
                                                                                                       water they
       oceans, and on land is                                                                          produce rain,
       always changing.                                                                                snow, or hail that
                                                                                                       falls down to Earth.
                                              Water in the atmosphere
                                              comes together in
                                              masses of tiny droplets
                                              to form clouds.














                                               Some rainwater and
                                               snowmelt soak into
                                               the ground, forming
                                               underground lakes
                                               known as aquifers.



                                                                                                 Rainwater and
                                                                                                 snowmelt find their
          Water evaporates from the sea                                                          way into rivers, which
          into the atmosphere. Plants                                                            eventually carry them
          release water in a process                                                             to the sea.
          called transpiration.



       Water of life
       Without water there                                       Breaking
       would be no life on                                       the cycle
       Earth. Even plants and                                    Humans break the water
       animals that live in very                                 cycle in several ways. We
       dry places, such as                                       dam rivers, suck up water
                                                                 from underground, and
       deserts, need some                                        use water for washing
       water to stay alive.                                      and drinking.



                                                             270





   US_270_Water_cycle.indd   270                                                                                 16/05/2017   09:52
   267   268   269   270   271   272   273   274   275   276   277