Here's why:
* Wind deposition: Wind can transport and deposit fine-grained sediments like sand, silt, and clay. When wind speed decreases, these sediments settle and accumulate, forming hills called dunes.
* Inspection: Wind-deposited sediments often have a distinct layering and texture that can be inspected to determine their origin.
* Other erosional agents: Other erosional agents, such as water, ice, and gravity, can also deposit sediments, but they are less likely to form hills of inspected sediments.
Let me know if you have any other questions!