The "sod" of the Palouse region came from ice-age glaciers that ground mountain rock into particles fine enough to be carried by the wind.
(The "sod" of the Palouse region; came; from ice-age glaciers) (ice-age glaciers; ground; mountain rock; into particles fine enough to be carried by the wind)
The "sod" of the Palouse region ice-age glaciers
came ground
from ice-age glaciers
mountain rock into particles fine enough to be carried by the wind