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Natural environment
Related to any physical feature of the earth's natural environment.
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Natural environment > Deserts 
Mesozoic Era
Natural environment; Deserts
66 to 245 million years ago, includes the Cretaceous, Jurassic and Triassic Periods.
Mojave Desert
Natural environment; Deserts
A portion of southern Nevada, extreme southwestern Utah and of eastern California, north of the Sonoran Desert.
North American Desert
Natural environment; Deserts
The vast arid region between the Rocky Mountains and Sierra Nevada of western North America, encompassing all four major American deserts
Painted Desert
Natural environment; Deserts
(1) A narrow desert strip running west of the Grand Canyon, north-to-south along U.S. Route 89, then turning east along Interstate 40 to just beyond Petrified Forest National ...
Pangea
Natural environment; Deserts
The super continent that broke apart 200 million years ago to form the present continents.
Sub-categories
- Air (43)
- Atmosphere (59)
- Climate (1147)
- Climate change (10457)
- Coral reefs (23903)
- Deserts (738)
- Earthquake (7143)
- Flood (34)
- Forests (37)
- Grassland (35)
- Land mass (144)
- Landslide (66)
- Mountains (203)
- Plateau (39)
- Speleology (1857)
- Volcano (5852)
- Water (18527)