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Subject
Valleys
[remove]
86
Rock formations
55
Cliffs
45
Hills
36
Buttes
33
National parks & reserves
31
Monument Valley (Ariz. and Utah)
27
Mesas
25
Deserts
22
Erosion
22
Mountains
20
Plains
19
Canyons
16
Petrified Forest National Park (Ariz.)
16
Grasses
15
Rivers
13
Shrubs
13
Trees
13
Painted Desert (Ariz.)
12
Grand Canyon (Ariz.)
11