Explain the formation of hums

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It's an isolated hill,left as a residue of the limestone at the polje floor named from the village of 'hum', in the nation of yugoslavian karst.They are often conicle or pyramidal in shape with uniform slopes,but those in the alluvium tend to be more convex profiles with basal steepening of their sides.Asymmetry in the residual hills has been attributed to greater rainfall and the solution on windward eastern sides,giving gentler slopes there(northern Peurto Rico) as per thorp's view point.
           Dianric karst feature based on the scheme of Civijic is perhaps the best,where hums form when elaborate cave systems eat into the karst margins and the poljes causing destruction of the karst and causing reappearance of normal valleys.steepheads recess karst margins and the poljes are planed afresh at the lower levels forming some hums.

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