I figured it was something to do with sand being light enough to be carried by wind, but that wouldn’t explain why the rest of the world lacks sand.
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Most deserts are not sand they are ice. It is the amount of precipitation during a year that defines a desert not surface material or temperature. The largest desert in the world is Antarctica.
Even if you look at warm deserts the large is Sahara but only 20% is sand. Most of it is stone plateaus. The sand and dirt have in large part been blown away.
The response is sand is dirt is mineral-like sand and organic part from plants. The organic part will get dried up and when the sane drift gets crushed to dust, new sand is produced all the time from rocks that get eroded by the wind, moving sand, etc.
Desert sand is not like the typical sand you find on the beach. On a beach, it is relatively large and not to rounded pieces of rock. Desert sand is a lot finer and has smooth edges. You can for example not use typical desert sand when you make concrete, countries like Saudi Arabia and other desert counties import huge amounts of sand for construction.
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