high, steep
崢 centers on a sharp, dramatic rise in terrain: a mountain that is high and steep, often with a sense of rugged prominence.
崢 combines 山 (mountain) with 爭, which likely contributes a phonetic element. The character is used to describe steep, towering mountain terrain.
A mountain 山 with the sharp, angular shape of 爭 on its side: imagine a peak so steep it looks like a jagged argument jutting into the sky.
For ソウ, picture a steep mountain so high it seems to touch the soul (ソウ) of the sky: soul -> ソウ, and the peak rises steeply upward.
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