searching the web for an answer to the same question, I found this:
http://www.pbs.org/wnet/Africa/explore/sahara/sahara_topography_lo.html
so, it seems the percentage of sand desert amount to 20. I hope this results to be useful. bye.
Seem to remember it being between 12% and 20% sand the rest rock, and scree
according to pub quiz book 2 the answer is only 28%...
Sand covers approximately 20 percent of planet Earth's deserts. The Sahara is the largest hot desert, and Antarctica is the largest cold desert.
About 2% (1,84% more precisely).
30.1 %
15%
18%
33% of the land surface of the earth is covered by deserts. Of that only 20 percent of the deserts are covered in sand.
About 20 percent of the land in deserts is covered by sand.
They aren't. Only a small percentage of deserts are covered with sand.
About 20 percent of desert land is covered by sand.
No, the desert covers a relatively small percentage of the total surface of the earth
About 20% of deserts are sand.
Only about 20 percent of the deserts of the world are covered with sand.
No, sand deserts account for about 20% of the deserts on earth.
About 20% of the deserts are covered by sand. Others are covered by soil or rock.
Sand only covers about 20% of deserts. The rest are covered by ice, soil or rock.
In most deserts, sand dunes are only a small area covered by the desert.
The Sahara Desert