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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 ...

repose

Natural environment; Volcano

The interval of time between volcanic eruptions.

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