. . . "Basalt (pronounced /b\u0259\u02C8s\u0254\u02D0lt/, /\u02C8b\u00E6s\u0252lt/, /\u02C8b\u00E6s\u0254\u02D0lt/, or /\u02C8be\u026As\u0254\u02D0lt/)is a common extrusive igneous (volcanic) rock formed from the rapid cooling of basaltic lava exposed at or very near the surface of a planet or moon. Flood basalt describes the formation in a series of lava basalt flows."@en . . . .