Eastern FrontManhattan Project, 4.3 Texas Legislature 4 Course of the war, Houston Texas Business Directory The major environmental threats to the Gulf are agricultural runoff and oil drilling. In contrast to the cities unincorporated rural settlements known as colonias often lack basic infrastructure and are marked by poverty the office of the Texas Attorney General stated in 2011 that Texas had about 2,294 colonias and estimates about 500,000 lived in the colonias Hidalgo County as of 2011 has the largest number of colonias. Texas has the largest number of people of all states living in colonias. See also: List of invasive marine fish in the Gulf of Mexico, 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.
Colleges and universities 1939 1940 1941 1942! Katy Besides coastal exploration Portuguese ships also made trips further out to gather meteorological and oceanographic information These voyages revealed the archipelagos of Bissagos Islands where the Portuguese were defeated by native people in 1535 Madeira the Azores Cape Verde Sao Tome Trindade and Martim Vaz Saint Peter and Saint Paul Archipelago Fernando de Noronha Corisco Elobey Grande Elobey Chico Annobon Island Ascension Island Bioko Island Falkland Islands Principe Island Saint Helena Island Tristan da Cunha Island and Sargasso Sea; .
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