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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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There are three images showing the movement of sand particles that the wind causing,and how the sand dunes consists through this operation.
The first image showing the condition of flat,sandy land when starts receiving the wind taking the sands particles from the dry places to the wet places.
When the sand particles reach the wet places they becoming wet too than they stand one over one, and with the affect of wid the dray sand particles still to those wet places and fixed there like the second image shows.
The third picture is giving us a result situation after this physic natural movement which showing how the gathering of the big quantity of sand particles in wet places is now making a large sand dunes,and those sand dunes are becoming like a barrier against the wind and re-derction its way.
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