The Lowlands are relatively flat with some rolling hills which are made up of sedimentary rock, the region was created during the Paleozoic era roughly 300 million years ago.

How were the lowlands created?

In the ice-free areas, lowlands formed because of the continued action of rivers. Streams debouching from the Rockies have spread sands, occasionally whipped up into sand hills, well beyond their banks; those funneling into the Mississippi River have created a vast plain that is known as the Mississippi delta.

How are plains and lowlands formed?

Plains occur as lowlands along valleys or at the base of mountains, as coastal plains, and as plateaus or uplands. ... Plains can be formed from flowing lava; from deposition of sediment by water, ice, or wind; or formed by erosion by the agents from hills and mountains.