How are sand dunes different from desert pavement?

Sand dunes are mounds or ridges of sand formed by the wind, characterized by their shifting shapes and heights, often found in sandy environments. In contrast, desert pavement consists of a surface layer of tightly packed gravel or stones, which forms when finer particles are blown away by the wind, leaving behind larger rocks. While sand dunes are dynamic and constantly changing, desert pavement is generally more stable and resistant to erosion. Both features are found in arid regions but represent different geological processes and surface conditions.