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Natural environment
Related to any physical feature of the earth's natural environment.
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Natural environment > Deserts 
alluvial fan
Natural environment; Deserts
A large, fan-shaped pile of sediment forming at the base of narrow canyons onto a flat plain at the foot of a mountain range.
alluvium
Natural environment; Deserts
Unconsolidated gravel, sand, silt and clay deposited by streams.
bajada
Natural environment; Deserts
A broad, sloping depositional deposit caused by the coalescing of alluvial fans.
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)