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The Geography of Texas

Texas is located at the southernmost part of the Great Plains, which ends in the south against the folded Sierra Madre Oriental of Mexico. It is in the south-central part of the United States of America.

Texas' size and unique history makes its regional affiliation debatable. Depending on the source, it can be fairly considered either or both a Southern or Southwestern state. The vast geographic, economic, and cultural diversity within the state itself prohibits easy categorization of the whole state into a recognized region of the United States. The East, Central, and North Texas, regions have a stronger association with the American South than with the Southwest. Others, such as far West Texas and South Texas share more similarities with the latter.

The Rio Grande, Red River and Sabine River form natural state borders, Oklahoma on the north, Louisiana and Arkansas on the east, & the Mexican states of Chihuahua, Coahuila, Nuevo León, and Tamaulipas to the south. The state's Texas Panhandle has an eastern border with Oklahoma at 100° W, a northern border with Oklahoma at 36°30' N and a western border with New Mexico at 103° W. El Paso lies on the state's western tip at 32° N and the Rio Grande.

The Geology of Texas

Texas is the southernmost part of the Great Plains, which ends in the south against the folded Sierra Madre Occidental of Mexico. The continental crust forms a stable Mesoproterozoic craton which changes across a broad continental margin and transitional crust into true oceanic crust of the Gulf of Mexico. The oldest rocks in Texas date from the Mesoproterozoic and are about 1,600 million years old. These Precambrian igneous and metamorphic rocks underlie most of the state, and are exposed in three places: Llano uplift, Van Horn, and the Franklin Mountains, near El Paso. Sedimentary rocks overlay most of these ancient rocks. The oldest sediments were deposited on the flanks of a rifted continental margin, or passive margin that developed during Cambrian time. This margin existed until Laurasia and Gondwana collided in the Pennsylvanian era to form Pangea. This is the buried crest of the Appalachian Mountains-Ouachita Mountains zone of Pennsylvanian continental collision. This orogenic crest is today buried beneath the Dallas-Waco-Austin-San Antonio trend.

The late Paleozoic mountains collapsed as rifting in the Jurassic era began to open the Gulf of Mexico. Pangea began to break up in the Triassic but seafloor spreading to form the Gulf of Mexico occurred only in the mid and late Jurassic. The shoreline shifted again to the eastern margin of the state and the Gulf of Mexico passive margin began to form. Today 9 miles (14 km) to 12 miles (19 km) of sediments are buried beneath the Texas continental shelf and a large proportion of remaining US oil reserves are located here. At the start of its formation, the incipient Gulf of Mexico basin was restricted and seawater often evaporated completely to form thick evaporite deposits of Jurassic age. These salt deposits formed salt dome diapirs, and are found in East Texas, along the Gulf coast.

East Texas outcrops consist of Cretaceous and Paleogene sediments which contain important deposits of Eocenelignite. The Mississippian and Pennsylvanian sediments in the north, Permian sediments in the west, Cretaceous sediments in the east, and along the Gulf coast and out on the Texas continental shelf contain oil. Oligocene volcanic rocks are found in far west Texas, in the Big Bend area. A blanket of Miocene sediments known as the Ogallala formation in the western high plains region is an important aquifer. Located far from an active plate tectonic boundary, Texas has no volcanoes and few earthquakes.

The Climate of Texas

The large size of Texas and its location at the intersection of multiple climate zones gives the state very variable weather. The Panhandle of the state has colder winters than North Texas, while the Gulf Coast has mild winters. Texas has wide variations in precipitation patterns. El Paso, on the western end of the state, averages as little as 8 inches (200 mm) of annual rainfall while Houston, on the southeast Texas averages as much as 54 inches (1,400 mm) per year. Dallas in the North Central region averages a more moderate 37 inches (940 mm) per year. Snowfall often falls in the winter months in the north. Maximum temperatures in the summer months average from the 80s °F (26 °C) in the mountains of West Texas and on Galveston Island to around 100 °F (38 °C) in the Rio Grande Valley. Night time summer temperatures range from the upper 50s °F (14 °C) in the West Texas mountains to 80 °F (27 °C) in Galveston.

Thunderstorms strike Texas often, especially the eastern and northern portion of the state. Tornado Alley covers the northern section of Texas. The state experiences the most tornadoes in the Union, an average of 139 a year. These strike most frequently in North Texas and the Panhandle. Tornadoes in Texas generally occur in the months of April, May, and June.

Some of the most destructive hurricanes in U.S. history have impacted Texas. A hurricane in 1875 killed approximately 400 people in Indianola, followed by another hurricane in 1886 that destroyed the town, at the time the most important port city in the state. This allowed Galveston to take over as the chief port city, the Galveston hurricane of 1900 subsequently devastated that city killing approximately 8,000 people (possibly as many as 12,000), making it the deadliest natural disaster in U.S. history. Other devastating Texas hurricanes include the 1915 Galveston Hurricane, Hurricane Audrey in 1957, which killed over 600 people, Hurricane Carla in 1961, Hurricane Beulah in 1967, Hurricane Alicia in 1983, Hurricane Rita in 2005, and Hurricane Ike in 2008.

Texas emits the most greenhouse gases in the US. The state's emits nearly 1.5 trillion pounds (680 billion kg) of carbon dioxide annually. As an independent nation Texas would rank as the world's seventh-largest producer of greenhouse gases. Causes of the state's vast greenhouse gas emissions include the state's large number of coal power plants and the state's refining and manufacturing industries.

Cities and Towns of Texas

As of 2000, six incorporated places in Texas have populations greater than 500,000, two of which are global cities: Houston and Dallas. Texas has a total of 25 metropolitan areas, with four having populations over 1 million and two over 5 million. Texas has the most cities, three, with populations exceeding 1 million: Houston, San Antonio, and Dallas. These three rank among the 10 largest cities of the United States. Austin, Fort Worth, and El Paso rank among the top 25 largest U.S. cities. Three interstate highways - I-35 to the west (Dallas-Fort Worth to San Antonio), I-45 to the east (Dallas to Houston), and I-10 to the south (San Antonio to Houston) forms the Texas Urban Triangle region. The region contains most of the state's largest cities and metropolitan areas, as well as nearly 75 percent of Texas's total population.

In contrast to the cities, Texas has rural, unincorporated settlements called colonias with often lack basic infrastructure and are marked by poverty. As of 2007, Texas had at least 2,294 colonias, located primarily along the state's 1,248-mile (2,008 km) border with Mexico. In total, Texas has the largest concentration of people, approximately 400,000, living in colonias.

[Source: Wikipedia: http://en.wikipedia.org/wiki/Texas]