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 the Winds (New York) Falls with water crashing down right on them and flowing beneath the decking. The decking is removed each fall due to the potential damage caused by ice buildup at the falls and re-installed each spring by park officials for sightseers to enjoy the experience. The decking is not secured to the rocks below by bolts or other construction materials; the wood beam supports are simply wedged into the rock crevices. Cave of the Winds (New York) The Cave of the Winds was a natural cave behind Bridal Veil Falls at the Niagara Falls. The cave was some high, wide and