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The [geomorphology] tag concerns the landforms and exogenous processes of the surface of the Earth or other solid surface planets.
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What are these lake-like blue patches in the desert, visible in satellite image?
The 'bluish' areas are exposed gypsum and gravel across which the sand dunes are moving. The colour is likely an artifact of the 'natural' colour palette used when processing the SPOT image. To unders …