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Natural environment
Related to any physical feature of the earth's natural environment.
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Natural environment > 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.
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