Most canyons are formed by flowing rivers through erosion over long periods of time, and striations in rock forms are seen along the river and tell the geologic history of the area. Given these facts, where can one readily see the geologic history of an area among the following options:
- down
 - scuba diving
 - soils
 - pastureland
 - canyon
 - driving
 - Mountains
 - mines


 

     canyon    