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Subject
- Deserts[remove]29
- National parks & reserves[remove]29
- Petrified Forest National Park (Ariz.)[remove]29
- Petrified forests23
- Hills21
- Mesas15
- Rock formations15
- Erosion14
- Valleys14
- Blue Mesa (Ariz.)12
- Painted Desert (Ariz.)9
- Rocks9
- Grasses8
- Cliffs7
- Jasper Forest (Ariz.)4
- Logs3
- Quartz3
- Shrubs3
- Rivers2
- Boulders1