Igneous rock the partial melting of rocks within the mantle and crust. Extrusive igneous rocks cool and solidify quicker than intrusive igneous rocks. They are 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, solidifies at a faster rate. Hence such rocks are smooth, crystalline and fine-grained. Basalt is a common extrusive igneous rock and forms lava flows, lava sheets and lava plateaus. Some kinds of basalt solidify to form long polygonal columns. The Giant's Causeway in Antrim, Northern Ireland is an example. The molten rock, with
Cave Temples of Mahabalipuram caves is that of the goddess Durga (a form of goddess Shakti) who killed Mahishasura the buffalo-headed demon which has a natural beauty with elegance of sense of movement, and this bas-relief panel in the Mahsisuramardhini Cave Temple is considered a masterpiece of Indian art. Many of the caves of the Pallava period have remained incomplete. The procedure in creating these caves involved creation of a smooth rock face, then cutting columns through the polished rock faces of required size and then carving bas-reliefs on the walls of the cave. Some of the cave temples are covered by the UNESCO