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This differentiation between magma and lava is important when we consider the two classifications of igneous rock. This is because plutonic rocks are rocks formed when magma cools and solidifies below the earth's surface, and volcanic rocks are rocks formed when lava cools and solidifies on the earth's surface.
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.