Igneous rocks are formed from the solidification of molten rock material. There are two basic types. Intrusive igneous rocks crystallize below Earth's surface and the slow cooling that occurs there allows large crystals to form.Examples of intrusive igneous rocks are diorite, gabbro, granite, pegmatite, and peridotite.abbro is a coarse-grained, dark colored, intrusive igneous rock that contains feldspar, pyroxene and sometimes olivine. The specimen shown above is about two inches (five centimeters) across. Obsidian is a dark-colored volcanic glass that forms from the very rapid cooling of molten rock material.
McLennan County, Texas. McLennan County is a county located on the Edwards Plateau in Central Texas. As of the 2010 census, its population was 234,906. Its county seat is Waco. The U.S. census 2016 county population estimate is 247,934. The county is named for Neil McLennan, an early settler.
Cities > United States > Airports near Waco, TX. The closest airport to Waco is Waco Regional Airport (ACT). Distance from Waco Regional Airport to Waco, TX is 10,5 kilometers (6,5 miles). Waco Regional Airport is located approximately 10,5 kilometers (6,5 miles) northwest of Waco and about 52,5 kilometers (32,6 miles) east of Gatesville.