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Natural environment
Related to any physical feature of the earth's natural environment.
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Natural environment > Volcano 
vent
Natural environment; Volcano
The opening at the earth's surface through which volcanic materials issue forth.
tilt
Natural environment; Volcano
The angle between the slope of a part of a volcano and some reference. The reference may be the slope of the volcano at some previous time.
stalactite
Natural environment; Volcano
A cone shaped deposit of minerals hanging from the roof of a cavern.
ultramafic
Natural environment; Volcano
Igneous rocks made mostly of the mafic minerals hypersthene, augite, and/or olivine.
strike-slip fault
Natural environment; Volcano
A nearly vertical fault with side-slipping displacement.
volcanic neck
Natural environment; Volcano
A massive pillar of rock more resistant to erosion than the lavas and pyroclastic rocks of a volcanic cone.
trachyandesite
Natural environment; Volcano
An extrusive rock intermediate in composition between trachyte and andesite.
Sub-categories
- Air (43)
- Atmosphere (59)
- Climate (1147)
- Climate change (10457)
- Coral reefs (23903)
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- Flood (34)
- Forests (37)
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- Land mass (144)
- Landslide (66)
- Mountains (203)
- Plateau (39)
- Speleology (1857)
- Volcano (5852)
- Water (18527)