North America colonization 9 Emergency Services, Houston is well known for its oil and petrochemical industries which are leading contributors to the city's economy the industries located along the ship channel coupled with a growing population have caused a considerable increase in air pollution for the city each year Houston has excessive ozone levels and is ranked among the most ozone-polluted cities in the United States. Ground-level ozone or smog is Houston's predominant air pollution problem in 2011 Houston was ranked as the 17th most polluted city in the US according to the American Lung Association a 2007 assessment found the following twelve air pollutants to be definite risks to health in Houston:, Arts and theater Pedro de Candia (Panama 1527 Colombia and Ecuador 1528 Peru 1530); After the fort was constructed one of the ships returned to France and the other two were soon destroyed in storms stranding the settlers La Salle and his men searched overland for the Mississippi River traveling as far west as the Rio Grande and as far east as the Trinity River. Disease and hardship laid waste to the colony and by early January 1687 fewer than 45 people remained That month a third expedition launched a final attempt to find the Mississippi the expedition experienced much infighting and La Salle was ambushed and killed somewhere in East Texas.
. . . Cabral's voyage to Brazil and India 1500 Tactics Houston's topography is further defined by a large number of creeks and ditches Overall this intricate system of waterways is essential to flood control; Houston is well known as one of the most flood-prone cities in the United States. Since the mid-20th century the United States Army Corps of Engineers in cooperation with the city and Harris County Flood Control District has channelized paved widened and deepened extensive sections of all of the five major bayous specified above with the notable exception of some parts of the Buffalo near Memorial the Buffalo Bayou watershed also features two flood control reservoirs Addicks Reservoir and Barker Reservoir which retain large amounts of water after extreme rainfall events. North America, Main articles: Demographics of Houston and Religion in Houston, Mission Concepcion is one of the San Antonio missions which is part of a National Historic Landmark. . . Texas Hill Country North America, In the early 1990s many older office buildings throughout Houston remained unoccupied At the same time newer office buildings for major corporations opened, Terminal E at George Bush Intercontinental Airport in Houston.
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