Ans: Water logging and Salinity:
Underground water level rises and comes very close to the surface of the
earth, this condition is called water-logging. Underground salts dissolve in
this water and come to the surface of the Earth. Water evaporates due to
heat of the sun and leaves these salts on the surface. These salts make a
crust on earth surface, this condition is called salinity. Water logging and
salinity destroy the fertility of land and make cultivation impossible. Our
govemments have made substantial efforts to fight water logging are
salinity. Despite all the efforts being made by our government, milions
acres of land has been spplied by water logging and salinity. Thousands of
acres are still being destroyed on yearly basis, in the provinces of the
Punjab and Sindin.