Deflation is a geological process related to the removal of surface materials, primarily driven by wind. It results in changes to the landscape and can lead to various environmental issues. Other options like rain, glaciation, and snow are not associated with deflation. ;
Deflation is primarily linked to the action of wind, which removes surface materials and alters landscapes in arid regions. Other options like rain, glaciation, and snow do not cause deflation as they involve different processes. Thus, the correct answer is D. Wind.
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