. Houston is a flat marshy area where an extensive drainage system has been built the adjoining prairie land drains into the city which is prone to flooding. Underpinning Houston's land surface are unconsolidated clays clay shales and poorly cemented sands up to several miles deep the region's geology developed from river deposits formed from the erosion of the Rocky Mountains These sediments consist of a series of sands and clays deposited on decaying organic marine matter that over time transformed into oil and natural gas Beneath the layers of sediment is a water-deposited layer of halite a rock salt the porous layers were compressed over time and forced upward As it pushed upward the salt dragged surrounding sediments into salt dome formations often trapping oil and gas that seeped from the surrounding porous sands the thick rich sometimes black surface soil is suitable for rice farming in suburban outskirts where the city continues to grow. . . . . In total 34.2% (7,660,406) of Texas's population aged five and older spoke a language at home other than English Further information: Pre-Columbian Mexico.
. Houston Texas Business Directory In 1874 Houston's first permanent public transit system began to be operated by the Houston City Street Railway Company. From 1874 until 1891 all of the transit service was operated using mule-driven streetcars when electric streetcars began to be implemented in their place the conversion to electric streetcars was completed in 1892. . !
Mercy Hospital