| 
                                                                       Down
                                                                      Under From
                                                                      Up Above 
                                                                      Shark
                                                                      Bay,
                                                                      Australia
                                                                      as seen by
                                                                      the
                                                                      Expedition
                                                                      10 crew on
                                                                      the
                                                                      International
                                                                      Space
                                                                      Station.
                                                                      This image
                                                                      shows
                                                                      large
                                                                      solar salt
                                                                      works
                                                                      developed
                                                                      in Useless
                                                                      Loop and
                                                                      Useless
                                                                      Inlet. The
                                                                      salt is
                                                                      produced
                                                                      when ponds
                                                                      are
                                                                      repeatedly
                                                                      flooded
                                                                      with
                                                                      seawater,
                                                                      which is
                                                                      progressively
                                                                      concentrated
                                                                      by
                                                                      evaporation.
                                                                      This
                                                                      particular
                                                                      salt farm
                                                                      opened in
                                                                      1967 and
                                                                      expanded
                                                                      operations
                                                                      in the
                                                                      1990s.
                                                                      Today,
                                                                      this salt
                                                                      farm
                                                                      comprises
                                                                      over 50
                                                                      ponds, the
                                                                      newest
                                                                      pond in
                                                                      the
                                                                      outermost
                                                                      pond in
                                                                      Useless
                                                                      Inlet,
                                                                      which
                                                                      provides
                                                                      the first
                                                                      evaporation
                                                                      cycle to
                                                                      increase
                                                                      the
                                                                      salinity
                                                                      of the
                                                                      water
                                                                      prior to
                                                                      entering
                                                                      the next
                                                                      pond.
                                                                      Complex
                                                                      chemical
                                                                      and
                                                                      biological
                                                                      adjustments
                                                                      occur in
                                                                      the system
                                                                      each time
                                                                      the
                                                                      configuration
                                                                      of ponds
                                                                      is
                                                                      changed.  |