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 of El Soplao varied columns. As in the Galería of the Cauliflower can be seen traces of an earthquake. Located to the east. It is one of the highest, reaching 30 metres high. Its length exceeds 160 metres. Notable cast sheets, giant stalagmites pisolithic nests. Its name comes from the number of colours displayed on it, because of the variety of salts dissolved in water. This is the list of minerals and fossils found in the cave, in alphabetical order: Cantabrian Speleogical Club "The Cave of El Soplao, an unique cave" (1987) Cave of El Soplao El Soplao (Cantabrian: El Soplau) is a