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Natural environment
Related to any physical feature of the earth's natural environment.
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acid
Natural environment; Volcano
A descriptive term applied to igneous rocks with more than 60% silica (SiO2).
active volcano
Natural environment; Volcano
A volcano that is erupting. Also, a volcano that is not presently erupting, but that has erupted within historical time and is considered likely to do so in the future.
agglutinate
Natural environment; Volcano
A pyroclastic deposit consisting of an accumulation of originally plastic ejecta and formed by the coherence of the fragments upon solidification.
alkalic
Natural environment; Volcano
Rocks which contain above average amounts of sodium and/or potassium for the group of rocks for which it belongs. For example, the basalts of the capping stage of Hawaiian ...
andesite
Natural environment; Volcano
Volcanic rock (or lava) characteristically medium dark in color and containing 54 to 62 percent silica and moderate amounts of iron and magnesium.
ash
Natural environment; Volcano
Fine particles of pulverized rock blown from an explosion vent. Measuring less than 1/10 inch in diameter, ash may be either solid or molten when first erupted. By far the most ...
ashfall
Natural environment; Volcano
Volcanic ash that has fallen through the air from an eruption cloud. A deposit so formed is usually well sorted and layered.
Sub-categories
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- 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)