The soil is formed by breaking down of large rock surfaces into pieces due to water, wind and all atmospheric changes by mixing with plants and animal decays. This process is called as weathering.
The one way how the progressives differed from populists is the populists are almost farmers whereas the progressives are typicaly middle class people who lives in the cities.
Dear Lodger, I agree, the roof is leaking; but (there would be no need) P (while it is raining) Q (and when the Sun shines,) R (I can’t get it repaired) S