The document is a PowerPoint presentation about different types of plains. It defines plains as areas that are not rugged and not much higher than sea level. It then describes three types of plains: structural plains, which are formed from uplifting or lowering of the earth's surface; erosional plains, which are formed from leveling of rugged areas by erosion; and depositional plains, which are formed over time from materials deposited by agents like water, wind, and glaciers.