Final answer:
The state with the Loess Hills in the west and the Paleozoic Plateau in the northeast is Iowa.
Step-by-step explanation:
The state that has the Loess Hills in the west and the Paleozoic Plateau in the northeast is Iowa. In the central U.S., this state is characterized by these unique geographical features. The Loess Hills are made up of fine silt deposited by wind over thousands of years, creating sharp ridges and steep slopes. On the other hand, the Paleozoic Plateau, also known as the Driftless Area, avoided glaciation during the last Ice Age, which left much of the rest of the Midwest flattened. Consequently, this plateau has deeply carved river valleys and high elevations, with sedimentary rocks from the Paleozoic era, such as limestones and shales, being prominent in the area.