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
Fingal, Ontario Fingal, Ontario Fingal is a small community near the north shore of Lake Erie 12 km southwest of St. Thomas, Ontario, located within the township of Southwold in Elgin County. Located in Fingal is the historic RCAF Station Fingal, which was a major centre for air force training during World War II. Now named the Fingal Wildlife Management Area its 724 acres are now a protected natural area. The Southwold Township office and the Fingal Presbyterian Church are also located in Fingal, as well as the local businesses; Stan's Total Tire, Summit Food Distribution, Fingal Farm Supply Ltd and Advantage