❓ why
Why are some deserts covered with dunes while others are rocky?
DesertsGeomorphology
Quick Answer
Wind, sediment supply, and rock type decide the surface. Dunes form where loose sand is abundant, while rocky deserts are left where finer material has been blown away.
The Full Story
Deserts are not all sandy; many are dominated by gravel, exposed bedrock, or salt flats. Sand dunes form when wind has enough loose, fine-grained sediment to transport and pile into hills, often near ancient river deposits or weathered rock sources. Rocky deserts, called hamadas, can develop where erosion and wind remove the finer material and leave the bedrock bare. The surface you see depends on local geology, wind patterns, and the history of water and sediment in the region.
Key Facts
1.Dunes need abundant loose sand
2.Rocky deserts are often called hamadas
3.Wind can remove fine particles and leave bedrock behind
YouTube Angle
Suggested video title for this topic:
"Why is one desert a sea of sand while another is all rock?"