September 16 - Physical patterns of Middle America Eleven...

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September 16, 2010 Physical patterns of Middle America Eleven Major Physiographic Provinces 1. The Mexican Plateau #5 a. The Plateau Surface i. Mesa del Norte – arid to the north, reaching south to San Luis Potosi (22N). ii. Mesa Central – moist southern half of plateau with basin and range topography. iii. Volcanic Axis or Neovolcanic Range – High volcanoes, many still active, between 14000 and 18000 feet in elevation; Mount Orizaba #2, Popocatepetl , Ixtaccahuatl, Toluca, Colima iv. Basins – just north fertile, flat-floored basins that once contained lakes; largest includes Mexico, Huamantla, Puebla, Toluca, Morelia, Guadalajara, and the Bajio of Guanajara, and the Baijo of Guanajuato. v. Three main river systems drain most of the Mesa Central 1.) the Santiago-Lerna, 2.) the Panuco-Mectezuma, and 3.) the Balsas . b. The Plateau Escarpments i. Sierra Madre Oriental #6– elongated limestone ranges from 7- 8,000’ with peaks to 13,000’ that resulted from geological folding of the bedrock.
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