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Subject
- Deserts[remove]28
- Hills[remove]28
- National parks & reserves28
- Petrified Forest National Park (Ariz.)[remove]28
- Petrified forests18
- Valleys15
- Mesas12
- Rocks12
- Erosion10
- Rock formations10
- Painted Desert (Ariz.)9
- Blue Mesa (Ariz.)8
- Boulders6
- Cliffs5
- Grasses5
- Logs5
- Shrubs5
- Fossils2
- People2
- Petrified wood2