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Subject
Deserts
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44
Hills
[remove]
44
National parks & reserves
28
Petrified Forest National Park (Ariz.)
28
Valleys
20
Mesas
18
Painted Desert (Ariz.)
18
Petrified forests
18
Rocks
13
Rock formations
12
Shrubs
12
Erosion
10
Blue Mesa (Ariz.)
8
Cliffs
8
Mountains
8
Grasses
7
Boulders
6
Logs
5
Rivers
4
Air travel
3