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A: Basalt is primarily formed by the extrusion of lava flows onto the surface of the earth during a volcanic eruption. The intrusion of a narrow sill or igneous dike below the crust also results in the formation of basalt. Basalt is a type of igneous rock that is typically dark in coloration with a fine-grained texture. It is the most predominant rock type found in Earth's crust, and mainly consists of pyroxene and plagioclase minerals. Volcanoes that form basalt are commonly found near the ocean basins.
Igneous Rocks. Igneous Rocks are rocks that have crystallized from molten rock, or magma. Magma is generated in the subsurface where it may solidify to form a plutonic rock, such as granite. The magma may also rise to the surface and erupt out of a volcano or volcanic fissure to form a volcanic rock, such as basalt.Igneous rock composition. Magma has a range of composition that is dominated by the elements silicon and oxygen, or silica (SiO 2).agma is generated in the subsurface where it may solidify to form a plutonic rock, such as granite. The magma may also rise to the surface and erupt out of a volcano or volcanic fissure to form a volcanic rock, such as basalt.