Houston is located 165 miles (266 km) east of Austin,[54] 88 miles (142 km) west of the Louisiana border,[55] and 250 miles (400 km) south of Dallas.[56] The city has a total area of 637.4 square miles (1,651 km2);[8] this comprises over 599.59 square miles (1,552.9 km2) of land and 22.3 square miles (58 km2) covered by water.[57] Most of Houston is located on the gulf coastal plain, and its vegetation is classified as Western Gulf coastal grasslands while further north, it transitions into a subtropical jungle, the Big Thicket. Much of the city was built on forested land, marshes, swamp, and are all still visible in surrounding areas.[citation needed] Flat terrain and extensive greenfield development have combined to worsen flooding.[58] Downtown stands about 50 feet (15 m) above sea level,[59] and the highest point in far northwest Houston is about 150 feet (46 m) in elevation.[60] The city once relied on groundwater for its needs, but land subsidence forced the city to turn to ground-level water sources such as Lake Houston, Lake Conroe, and Lake Livingston.[11][61] The city owns surface water rights for 1.20 billion gallons of water a day in addition to 150 million gallons a day of groundwater.[62]
During the late 1970s, Houston had a population boom as people from the Rust Belt states moved to Texas in large numbers.[36] The new residents came for numerous employment opportunities in the petroleum industry, created as a result of the Arab oil embargo. With the increase in professional jobs, Houston has become a destination for many college-educated persons, most recently including African Americans in a reverse Great Migration from northern areas.
^ Adventist historian George R. Knight notes several other leading evangelicals who considered Adventist doctrine to be heterodox; these included Donald Barnhouse (prior to 1950), Norman F. Douty, Herbert S. Bird, E. B. Jones, Louis B. Talbot and M. R. DeHaan. See "Questions on Doctrine, annotated edition". Andrews University Press. 2003: xiii–xxxiii Sabbath-keeping
