عدد المساهمات : 621 نقاط : 1810 تاريخ التسجيل : 18/11/2011
موضوع: Desert features الخميس أبريل 19, 2012 12:32 am
Sand covers only about 20% of Earth's deserts. Most of the sand is in sand sheets and sand seas—vast regions of undulating dunes resembling ocean waves "frozen" in an instant of time. In general, there are five forms of deserts:
الرئيسية 
