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The image displays a three-stage diagram illustrating sand dune formation, accompanied by a legend and a caption. The legend defines symbols for Wind, Sand Particle, Wet Sand, and Dry Ground. In the first stage, wind transports 5 airborne sand particles, with 3 landing on a patch of wet sand that has 6 existing particles, and 2 landing on a second patch with 3 existing particles. In the second stage, the first pile has grown to approximately 14 particles, deflecting more windborne particles towards the second pile, which now has 6 particles. In the third stage, the first pile has become a large dune of approximately 36 particles, while the second has become a smaller dune of approximately 16 particles. The caption reads: '*Sand dune: sand gradually formed in deserts / on coast.'
Given the complexity of the image, the above description may not be entirely accurate.
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The picture depicts the process of sand ridge formation. Overall, this process includes three main stages, starting with the movement of sand particles caused by strong wind from dry to wet regions, and ending with the formation of a mass hill of sand.
At the first stage, gentle wind from coastal areas brings sand grains from dry ground to underground wet sand. Since those sand particles cannot be absorbed, they gather and form several mounds of sand.
At the following stage, due to the significant effect of strong winds, specks of sand are continuously flown to the holes of wet sand, leading to an increase in the height and density of sand dunes. Lastly, when the granules of sand stop moving, thanks to the assistance of wind, sandbanks are finally formed and remain stable on the top of wet sand areas that they moved to.
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