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Subject
- Erosion[remove]4
- Rock formations4
- Buttes2
- Cliffs2
- National parks & reserves2
- Tree limbs2
- Bright Angel Lodge (Ariz.)1
- Cajon Pass (Calif.)1
- Canyons1
- Deserts1
- Grand Canyon (Ariz.)1
- Grand Canyon National Park (Ariz.)1
- Grasses1
- Hills1
- Painted Desert (Ariz.)1
- Passes (Landforms)1
- Petrified Forest National Park (Ariz.)1
- Petrified forests1
- Valleys1