Two commercial airports George Bush Intercontinental Airport and William P Hobby Airport are located in Houston and in Harris County the Houston Airport System defines Harris County as a part of Bush Intercontinental's service region the city of Houston operates Ellington Field a general aviation and military airport in Harris County, According to Children at Risk a local nonprofit research organization 21% of the Harris County children live in poverty 6.5 per 1,000 die before age one and 38% drop out of high school. 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. .
. San Antonio's South Texas Medical Center facilities rank sixth in clinical medicine research impact in the United States the University of Texas Health Science Center is another highly ranked research and educational institution in San Antonio. ; . 1.3 Winter Greenway Plaza Spanish exploration See also: List of airports in Texas After receiving notice from Juan de Grijalva of gold in the area of what is now Tabasco the governor of Cuba Diego de Velasquez sent a larger force than had previously sailed and appointed Cortes as Captain-General of the Armada Cortes then applied all of his funds mortgaged his estates and borrowed from merchants and friends to outfit his ships Velasquez may have contributed to the effort but the government of Spain offered no financial support. A few professional sports teams are located in East Texas the East Texas Pump Jacks located in Kilgore play baseball in the Texas Collegiate League Additionally the East Texas Storm a semiprofessional football team located in Tyler competes in the Lone Star Minor League. Typically northern parts of East Texas tend to support the professional teams from the Dallas/Fort Worth area (Dallas Cowboys Dallas Mavericks Texas Rangers Dallas Stars) while southern parts of East Texas tend to support professional teams from the Houston area (Houston Texans Houston Rockets Houston Astros).
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