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Subject
Hills
[remove]
43
National parks & reserves
32
Petrified Forest National Park (Ariz.)
32
Deserts
29
Petrified forests
22
Rock formations
22
Valleys
22
Mesas
16
Cliffs
15
Erosion
15
Rocks
15
Buttes
11
Painted Desert (Ariz.)
11
Shrubs
11
Blue Mesa (Ariz.)
9
Boulders
7
Grasses
6
Fossils
5
Petrified wood
5
Logs
4
