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
S and S Consolidated Independent School District for which community. In 2009, the school district was rated "recognized" by the Texas Education Agency. S&S Consolidated ISD has a total of three schools - two in Sadler and one in Southmayd. S and S Consolidated Independent School District S and S Consolidated Independent School District is a public school district based in Sadler, Texas. The first graduating class from S and S was in 1961. The district serves the cities of Sadler and Southmayd as well as rural areas in west central Grayson County, and was formed by consolidation of prior districts in 1961. Though Sadler is the