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Natural environment
Related to any physical feature of the earth's natural environment.
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Natural environment > Speleology 
caving
Natural environment; Speleology
The sport of exploring caves. Synonyms: (British.) potholing; spelunking.
potholing
Natural environment; Speleology
The sport of exploring caves. Synonyms: caving; spelunking.
spelunking
Natural environment; Speleology
The sport of exploring caves. Synonyms: (British.) potholing; caving.
cave pearl
Natural environment; Speleology
Carbonate concretion, usually of calcite, that is spherical or irregular in shape, with an internal structure of concentric banding round a central grain. Pearls form in pools of ...
pisolite
Natural environment; Speleology
Carbonate concretion, usually of calcite, that is spherical or irregular in shape, with an internal structure of concentric banding round a central grain. Pearls form in pools of ...
pisolith
Natural environment; Speleology
Carbonate concretion, usually of calcite, that is spherical or irregular in shape, with an internal structure of concentric banding round a central grain. Pearls form in pools of ...
trogloxene
Natural environment; Speleology
An animal that habitually enters caves, but must return periodically to the surface for certain of its living requirements, usually food.
Sub-categories
- Air (43)
- Atmosphere (59)
- Climate (1147)
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- Water (18527)