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Natural environment
Related to any physical feature of the earth's natural environment.
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Natural environment > Volcano 
seismometer
Natural environment; Volcano
An instrument that measures motion of the ground caused by earthquake waves.
xenocrysts
Natural environment; Volcano
A crystal that resembles a phenocryst in igneous rock, but is a foreign to the body of rock in which it occurs.
water table
Natural environment; Volcano
The surface between where the pore space in rock is filled with water and where the the pore space in rock is filled with air.
vulcanian
Natural environment; Volcano
A type of eruption consisting of the explosive ejection of incandescent fragments of new viscous lava, usually on the form of blocks.
stratovolcano
Natural environment; Volcano
A volcano composed of both lava flows and pyroclastic material.
stratigraphic
Natural environment; Volcano
Refers to the study of rock strata, especially of their distribution, deposition, and age.
volcanic complex
Natural environment; Volcano
A persistent volcanic vent area that has built a complex combination of volcanic landforms.
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)