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Subject
- Erosion[remove]95
- Rock formations82
- Cliffs81
- Buttes60
- National parks & reserves58
- Canyons53
- Mesas48
- Grand Canyon (Ariz.)46
- Grand Canyon National Park (Ariz.)46
- Hills23
- Valleys22
- Trees20
- Petrified Forest National Park (Ariz.)15
- Deserts14
- Rivers14
- Grasses11
- Petrified forests11
- Shrubs11
- Colorado River (Colo.-Mexico)10
- Mountains10