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The image depicts three diagrams illustrating the process of sand dune formation with labeled elements: sand particles, wind direction, wet ground, and dry ground. In Diagram 1, several loosely spaced sand particles align along the left side and a cluster near a wet ground patch, arrows indicate wind blowing uniformly toward the right. Diagram 2 shows increased particle accumulation on both ground types, particularly with a significant sand pile forming over the wet ground, where the arrow's wind direction is consistent. Diagram 3 presents a more pronounced sand mound on the wet ground accumulating, some particles displaced to the side, maintaining the wind's direction rightward, with a singular particle atop the mound directed leftward.
Given the complexity of the image, the above description may not be entirely accurate.
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The three pictures illustrate how to form the sand dunes from sand particles.
Overall, there are three clear stages in the process, starting with the sand particles which is affected by wind and ending with the sand dunes in the wet ground.
In the first diagram, the distinct sand particles are blown by wind over the dry to wet ground. In the second diagram, in the wet ground, there are more particles of sand move next to others, forming a wide range of small separate sand piles. In the final stage, all the sand piles collect into a big pile, which is called sand dunes. The dunes of sand can change the direction of wind, forcing them to up to their one side and down to the remaining side. Lastly, the process is started again to create more piles of sand in the wet ground, turning into the sand dunes
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