What percentage of the Sahara Desert is made up of sand?

9%
15%
21%
43%
Regions of sand dunes (erg) occupy only about 15% of the Sahara; "stone deserts," consisting of plateaus of denuded rock (hammada) or areas of coarse gravel (reg), cover about 70% of the region; mountains, oases, and transition zones account for the remainder.
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9%
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43%
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40%
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10
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58%
17%
17%
17
flagGermany
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20%
26%
15
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24%
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1261
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20%
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17%
35