Volcano

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.

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Volcano

central vent

Natural environment; Volcano

A central vent is an opening at the Earth's surface of a volcanic conduit of cylindrical or pipe-like form.

central volcano

Natural environment; Volcano

A volcano constructed by the ejection of debris and lava flows from a central point, forming a more or less symmetrical volcano.

cinder cone

Natural environment; Volcano

A volcanic cone built entirely of loose fragmented material (pyroclastics. )

pele tears

Natural environment; Volcano

Small, solidified drops of volcanic glass behind which trail pendants of Pele hair. They may be tear-shaped, spherical, or nearly cylindrical.

peralkaline

Natural environment; Volcano

Igneous rocks in which the molecular proportion of aluminum oxide is less than that of sodium and potassium oxides combined.

phenocryst

Natural environment; Volcano

A conspicuous, usually large, crystal embedded in porphyritic igneous rock.

phreatic eruption

Natural environment; Volcano

An explosive volcanic eruption caused when water and heated volcanic rocks interact to produce a violent expulsion of steam and pulverized rocks. Magma is not involved.