حل ت 1 ص 71 انجليزية 2 ثانوي طاسيلي الجزائري
May 02, 2018· AThroughout the world, deserts are created because pastures near arid lands heavily are grazed and trampledBAround towns, adjacent forest belts are denuded by people in their search for firewoodCMore productive plants are introduced into semiarid a result, indigenous plants necessary for the maintenance of the soil are nudged out