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Natural environment
Related to any physical feature of the earth's natural environment.
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Natural environment > Volcano
pumice
Natural environment; Volcano
Light-colored, frothy volcanic rock, usually of dacite or rhyolite composition, formed by the expansion of gas in erupting lava. Commonly seen as lumps or fragments of pea-size ...
pyroclastic
Natural environment; Volcano
Pertaining to fragmented (clastic) rock material formed by a volcanic explosion or ejection from a volcanic vent.
pyroclastic flow
Natural environment; Volcano
Lateral flowage of a turbulent mixture of hot gases and unsorted pyroclastic material (volcanic fragments, crystals, ash, pumice, and glass shards) that can move at high speed (50 ...
quaternary
Natural environment; Volcano
The period of Earth's history from about 2 million years ago to the present; also, the rocks and deposits of that age.
relief
Natural environment; Volcano
The vertical difference between the summit of a mountain and the adjacent valley or plain.
renewed volcanism state
Natural environment; Volcano
Refers to a state in the evolution of a typical Hawaiian volcano during which --after a long period of quiescence--lava and tephra erupt intermittently. Erosion and reef building ...
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