You never see a big mound of it or a finger-width layer even if the surface is left untouched for years whereas other “powdery” substances (like snow) can form layers of all sizes. Why is that?
In: Earth Science
In order for it to get thicker you would need people to never clean and move slowly so as not to disturb it. By just having people come and go and bring dirt from outside on their clothes and for them to never shower, you’ll get your thick layers. But most people don’t live like that.
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