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Subject
- Deserts[remove]22
- National parks & reserves[remove]22
- Rock formations[remove]22
- Petrified Forest National Park (Ariz.)18
- Petrified forests16
- Hills11
- Rocks11
- Blue Mesa (Ariz.)10
- Erosion9
- Mesas9
- Cliffs7
- Shrubs6
- Boulders4
- Grasses4
- Valleys4
- Caves3
- Jasper Forest (Ariz.)3
- Saguaro National Park (Ariz.)3
- Sarelinas, Cave of the (Ariz.)3
- Mountains2