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Natural environment
Related to any physical feature of the earth's natural environment.
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Natural environment > Volcano 
continental crust
Natural environment; Volcano
Solid, outer layers of the earth, including the rocks of the continents.
continental drift
Natural environment; Volcano
The theory that horizontal movement of the earth's surface causes slow, relative movements of the continents toward or away from one another.
country rocks
Natural environment; Volcano
The rock intruded by and surrounding an igneous intrusion.
crater
Natural environment; Volcano
A steep-sided, usually circular depression formed by either explosion or collapse at a volcanic vent.
craton
Natural environment; Volcano
A part of the earth's crust that has attained stability and has been little deformed for a prolonged period.
curtain of fire
Natural environment; Volcano
A row of coalescing lava fountains along a fissure; a typical feature of a Hawaiian-type eruption.
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)