Answers

2016-02-29T19:45:00+05:30
Sand dunes are heaps of sand in deserts due to the movement of wind.
These change their shape and position with respect to time and climate.

1 5 1
2016-02-29T20:43:25+05:30
When hot wind in the deserts blow sand heaps of sand get collected in a heap this creates sand dunes
0