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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.
Underground, they are formed when the melted rock, called magma, deep within the earth becomes trapped in small pockets. As these pockets of magma cool slowly underground, the magma becomes igneous rocks. Igneous rocks are also formed when volcanoes erupt, causing the magma to rise above the earth's surface.When magma appears above the earth, it is called lava.Igneous rocks are formed as the lava cools above ground. Source(s):he most common are the following: Basalt and gabbro are usually formed by volcanoes that have an oceanic crust origin, such as Hot Spot volcanoes such as the Hawaiian Islands. Andesitic rocks (Andesite) or Diorite are usually formed by subduction zone (strato-or compositive volcanoes) at convergent boundaries.