High Plains: Amarillo; Lubbock, Midland-Odessa
Sandy soil, flat; high altitude
Agriculture: cotton; wheat, sorghum
Texas Tech University, Lubbock; West Texas State, Canyon
West: El Paso, Big Bend National Park
Arid; yucca, salt flats, mountains
Sparse population;
Prairie: Wichita Falls, Fort Worth, Abilene
Sandy loam, mesquite, alternating prairie & cross timber (oak)
Texas Christian University, Fort Worth; Baylor University-Waco
Agriculture, cattle, cotton
Rio Grande Valley:Brownsville, San Antonio, McAllen, Laredo
Limestone, black dirt
Trinity College-San Antonio;
Citrus, ranching, farming
Central: Dallas, Austin, Bryan-College Station, Fredericksburg
Blackland gumbo, volatile contraction/expansion; chalk, limestone
Southern Methodist University, Dallas; University, Texas-Austin; Texas A&M-College Station; Southwestern University-Georgetown
Banking, high tech, mercantile, cotton, cattle
East:: Texarkana, Tyler, Longview, Beaumont
Sandy clay, pine trees
East Texas University-Commerce
Timber, petroleum
Gulf Coast: Houston, Galveston, Corpus Christi, Padre Island
Coastal soils, beaches, flat
Rice University, Houston;
Petroleum, sorghum, military
