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Subject
- Hills[remove]8
- National parks & reserves[remove]8
- Petrified Forest National Park (Ariz.)8
- Petrified forests8
- Rock formations[remove]8
- Deserts7
- Erosion5
- Valleys5
- Blue Mesa (Ariz.)4
- Cliffs3
- Mesas3
- Shrubs2
- Boulders1
- Grasses1
- Logs1
- Painted Desert (Ariz.)1
- Rivers1
- Rocks1
- Shadows1