How much of the Sahara is covered in sand?

15%
35%
55%
75%
The Sahara is mainly rocky hamada (stony plateaus).
correct this question
lukasz Poland
reach: rather globalAfricaauthor: lukasz Polanddesertsgeographygeography of AfricaSahara
15%
35%
55%
75%
answers
flagPoland
54%
13%
11%
20%
1358
flagGermany
40%
6%
26%
26%
15
flagthe United Kingdom
29%
29%
7%
33%
27
flagUnknown
27%
20%
18%
32%
43
flagthe United States
22%
17%
16%
43%
80