The southern Section of the Central Lowland is quite various, lined typically with loess (wind-deposited silt) that even more subdued the by now small reduction floor. In other places, Particularly close to main rivers, postglacial streams carved the loess into rounded hills, and readers have aptly compared their billowing shapes https://wwwkabarrcom83234.wikibriefing.com/1388480/the_definitive_guide_to_usa_info