see with their own eyes how desertification keeps progressing and how important trees are this is memnon when they're not far away from me on the bank of the river sand dunes here for the final trip will enable the pupils to understand the phenomenon of desertification but will also see what people can do locally to stop the spread of the desert and to anchor the sand. the gigantic duno of subtle ray at the gates of the capitol neon made. some of these sand dunes wander up to 20 meters a year depending on the wind their height can reach $30.00 to $40.00 metres the pupils are overwhelmed once they get to the top seed wow it's awesome i've never seen anything like this i've never been here before it's so beautiful. it's good maybe beautiful but it's a nightmare for humans and animals so you want it you don't want sand there instead bury your homes you have to try to prevent them from shifting. with sand drift fences for example sunny explains what everyone can do to help stop the shifting of the dunes the students are pensive. look after seeing this here i'm quite troubled. as you had some