One of the greatest things about driving across country is witnessing the climatic and geologic changes from one part of the country to another. Driving from east to west you encounter; deciduous forests, prarie, plains, mountains, high desert, and desert. The amount of precipitation that falls in the east and does not in the west is reflected in the changing colors and flora of the passing landscape. The cross country trip bears witness to these shifts in the landscape and reveal so much about each regions history and the history of American westward expansion. I think there is lots to be learned just looking out the car window...