sand hill is called mountain of sand
Rub Al-Khali or Empty Quarter
because the word desert is like deserted which means abandoned. a desert is not competely abandoned but there are a few people who live there
Less than 10 inches (250mm) of precipitation per year, or where more water is lost by h evapotranspiration than falls as precipitation.
Perhaps it is because deserts are big stretches of land, with nothing to fill them but sand- they are deserted.
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