'''Basalt''' is a green-gray to black [[Igneous rock|igneous rock]]. The most common [[volcanic]] [[rock]], it makes up most of the [[ocean]] floor. Basalt may occur in long [[columns]].
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'''Basalt''' is a green-gray to black [[Igneous_Rock|igneous rock]]. The most common [[volcanic]] [[rock]], it makes up most of the [[ocean]] floor. Basalt may occur in long [[columns]].