10 Terms
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Volcano
A vent or opening in a planet's surface that lets out pressurized molten rocks or magma, and gases from the inner core. Volcanoes come in various shapes and structure, but the most common ones are mountain-like structures with a crater at the summit.
Industry: Natural environment
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Volcano
Lava dome
Natural environment; Volcano
Mass of lava, created by many individual flows, that has built a dome-shaped pile of lava.
Juvenile
Natural environment; Volcano
Pyroclastic material derived directly from magma reaching the surface.
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 to 100 miles an ...
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 and larger, but can ...
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 continue.
Precambrian
Natural environment; Volcano
All geologic time from the beginning of Earth history to 570 million years ago. Also refers to the rocks that formed in that epoch.
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.
