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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

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15y ago

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