Our system will evaluate the answer based on this AI-generated description.
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.
Skyrocket your IELTS band score by 1-2 points in under a month with our premium plan!
Note: Both the topic and the answer were created by one of our users.
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 and stabilization of large dunes thanks to the wind strength.
At the first stage, wind blowing across dry ground carries sand grains to wet sand areas. The particles on the dry ground, are much lighter, are carried to wet regions by the wind. Thus, they gather and form small initial dunes.
At the following stage, due to the significant effect of strong winds, specks of sand are continuously transported into the depressions of wet sand, leading to an increase in the height and stability of sand dunes. Lastly, when the granules of sand stop moving, accumulated ridges are finally formed and remain stable on the top of wet sand areas where they are transported.
Word Count: 151
