Web Reference: Nov 8, 2023 · Extrusive igneous rocks are also termed volcanic rocks—named for Vulcan, the Roman god of fire. Volcanic rocks have generally smaller crystal size and usually have a very-fine-grained or glassy groundmass that formed due to rapid cooling at the time of eruption. Volcanic rocks, also known as lava rocks, are a diverse group of igneous rocks formed when magma or lava solidifies during volcanic eruptions. Their formation begins deep beneath the Earth's surface, where magma is generated. Extrusive igneous rock, also known as volcanic rock, is formed by the cooling of molten magma on the earth's surface. The magma, which is brought to the surface through fissures or volcanic eruptions, rapidly solidifies. Hence such rocks are fine-grained (aphanitic) or even glassy.
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