Oceanic volcanoes

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In a typical "oceanic" environment, volcanoes are aligned along the crest of a broad ridge that marks an active fracture system in the oceanic crust. Basaltic magma, generated in the upper mantle beneath the ridge, rise along fractures through the basaltic layer. Because the granitic crustal layer is absent, the magma are not appreciably modified or changed in composition and they erupt on the surface to form basaltic volcanoes. [1]

References

  1. Glossary of Volcano and Related Terminology (Tilling, 1985)
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