How the Great Plains Were Formed

The Great Plains fit the depositional pattern of plain landforms. Since the collision of several small continents a billion years ago, the Great Plains have been a relatively stable area dominantly developed through the deposition of sediments eroded from the Rocky Mountains to the west.

Great Plains - Wikipedia

Great Plains, Map, Facts, Definition, Climate, & Cities

Plain, Definition, Characteristics & Examples

Great Plains Facts for Kids

Encyclopedia of the Great Plains

Great Plains - Wikipedia

Missouri's Northern Plains Missouri Department of Conservation

PPT - The Great Plains PowerPoint Presentation, free download - ID

USGS: Geological Survey Bulletin 1493 (Landforms of Today-The Surface Features of the Great Plains)