Devil's Tower 형성과정
The geologic Tower formation theories NPS Photo 1: A superimposed digital drawing of a cylinder-shaped stock over a photo of the Tower. NPS Photo 2: A superimposed digital drawing of a mushroom cap-shaped laccolith over a photo of the Tower. NPS Photo 3: A superimposed digital drawing of a volcanic plug and neck stretching above a photo of the Tower. NPS Photo 4: A superimposed digital drawing ..
