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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.
Best Answer: Igneous rocks form from a melt of molten rock (magma, or lava) and can be Plutonic (intrusive) or Volcanic (extrusive). Plutonic rocks: * Generally form/solidify underground.Most commonly within magma tubes. * Have relatively large crystals.xtrusive rocks form from lava at or above the ground, and intrusive rocks form from magma below the ground. Granite is intrusive, pumice is extrusive or this: Igneous Rock, rock formed when molten or partially molten material, called magma, cools and solidifies.