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The chief industry of the section is the care of cattle.Over such an extended area the drainage is naturally diverse.The water supply may be made abundant mainly from wells at a depth of 100 to 600 feet.Attempts to utilize these for irrigation on a small scale are now being made.The fourth province is that of the Trans-Pecos Mountains, with elevations ranging from 5000 to 9500 feet.Here the chief wealth is in the minerals, consisting of silver, copper, and lead of good grade and some gold, tin, zinc, and quicksilver.
The annual rainfall on these mountains is as low as ten to fifteen inches, but irrigation of the valley lands is practised by means of impounded storm-water, and alfalfa and kafir-corn are commonly grown.
In the east there are numerous small streams flowing south and east into the Gulf of Mexico, in the Trans-Pecos region there are practically no streams at all that reach the sea.
In the arid regions the drainage channels flow only for a short time after rainfall.
Extending back from the Gulf Coast for from thirty to fifty miles, an outcrop of underlying clays gives a flat, almost treeless tract running along the whole length of the coast and known as the Coast Prairie.
The first of these, nearest the coast, is called the Coastal Plain, consisting of Coast Prairies, a Tertiary area, and Black Prairies.