Page:Tree Crops; A Permanent Agriculture (1929).pdf/41

 Fig. 15. Top. Photo George F. Ransome.)-FIG. 16. Bottom. (Photo Arthur Keith.) I am grateful to Dr. George Otis Smith and Messrs Ransome and Keith of the U. S. Geological Survey for this remarkable pair of pictures. They show essentially similar geologic formations. Both are old granite. In the dry climate of Powers Gulch near Globe, Arizona were is no vegetation to hold the rotting rock. At Roan Mountain Station, Carter County, Tennessee, the rain supports vegetation, and the vegetation holds the earth in which it lives and covers up the bare bones of granite.

If careful, very careful, man can keep his earth.