The thick loess deposits in south dakota, nebraska, and iowa come from

The thick loess deposits in South Dakota, Nebraska, and Iowa come from Glacial Sediments.

The glaciers contain ice, snow, water, rocks and sediment and when the glacier moves, it pushes rocks and sediments which is called glacial sediment. The thick loess deposits in South Dakota, Nebraska, and Iowa come from same Glacial Sediments of the Last Glacial Period (of Ice Age).

the wetland preservation movement began in the u.s. in earnest with the clean water act (cwa) of 1972. although not specifically written to protect wetlands, the cwa is comprised of a series of regulations designed to prevent pollutants from contaminating u.s. waters.