USA HISTORY

Detailed explanation-1: -From north to south, they extend from the Red River to the Colorado River.

Detailed explanation-2: -The North Central Plains are the southeastern reaches of the Panhandle region of the state. To the north, the Red River marks the boundary with the High Plains region and Oklahoma, while the Caprock Escarpment separates it from the Llano Estacado to the west.

Detailed explanation-3: -The Great Plains. This elevated, flat surfaced region slopes gradually eastward from the Rocky Mountains. In Texas, this region is divided into three distinct sub-regions: the High Plains, the Edwards Plateau and the Llano Basin.

Detailed explanation-4: -The definition of the Great Plains is debated. Typically, it refers to the territory from Montana to Minnesota and down to New Mexico and Texas. In this study, a 12-state area is used, including Colorado, Iowa, Kansas, Minnesota, Montana, Nebraska, New Mexico, North Dakota, Oklahoma, South Dakota, Texas, and Wyoming.

Detailed explanation-5: -They are occasionally interrupted by buttes and escarpments. They are frequently broken by valleys. Yet on the whole, a broadly extended surface of moderate relief so often prevails that the name, Great Plains, for the region as a whole is well-deserved.