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In a typical "oceanic" [[environment]], [[volcano|volcanoes]] are alined along the [[crest]] of a broad [[ridge]] that marks an active [[fracture]] system in the oceanic [[crust]]. [[Basalt|Basaltic]] [[magma]]s, generated in the upper [[mantle]] beneath the ridge, rise along fractures through the basaltic layer. Because the [[granite|granitic]] crustal layer is absent, the magmas are not appreciably modified or changed in [[composition]] and they [[erupt]] on the surface to form basaltic volcanoes. <ref>[http://vulcan.wr.usgs.gov/Glossary/volcano_terminology.html Glossary of Volcano and Related Terminology (Tilling, 1985)]</ref>
==References==
<references/>
[[category:Volcanology]]
==References==
<references/>
[[category:Volcanology]]