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Natural environment
Related to any physical feature of the earth's natural environment.
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Natural environment > Volcano 
dacite
Natural environment; Volcano
Volcanic rock (or lava) that characteristically is light in color and contains 62% to 69% silica and moderate a mounts of sodium and potassium.
debris avalanche
Natural environment; Volcano
A rapid and unusually sudden sliding or flowage of unsorted masses of rock and other material. As applied to the major avalanche involved in the eruption of Mount St. Helens, a ...
debris flow
Natural environment; Volcano
A mixture of water-saturated rock debris that flows downslope under the force of gravity (also called lahar or mudflow).
detachment plane
Natural environment; Volcano
The surface along which a landslide disconnects from its original position.
Devonian
Natural environment; Volcano
A period of time in the Paleozoic Era that covered the time span between 400 and 345 million years.
diatreme
Natural environment; Volcano
A breccia filled volcanic pipe that was formed by a gaseous explosion.
dike
Natural environment; Volcano
A sheetlike body of igneous rock that cuts across layering or contacts in the rock into which it intrudes.
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)