LANDFORMS OF TEXAS

LANDFORMS OF TEXAS - LANDFORMSOFTEXAS I. Introduction

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LANDFORMS OF TEXAS I. Introduction             Texas is a very large state with tremendously diverse climates and landforms              Texas contains parts of the following five major North American physiographic  provinces: the  Gulf Coastal Plain, the Interior Lowlands, the Great Plains, the Rocky Mountains, and the  Basin and RangeProvince.              Texas can be carved into many distinctive local provinces   II. Gulf Coastal Plain             Borders the western Gulf of Mexico, in an arc 180 miles wide, from the Sabine  River on the northeast to the Rio Grande border with Mexico.             Shows little topographic relief, but its surface rises gently inland             Elevation and aridity increases from northeast to southwest (toward Del Rio) and  the vegetation changes accordingly             The coastal plain is the surface expression of a thick wedge of sediment dumped  onto the subsiding Gulf of Mexico crust since Cretaceous time, more than sixty million  years ago.              The plain has been created during Cenozoic time by rivers eroding mountains to  the west and transporting enormous volumes of sediment to coalescing deltas of the Gulf  of Mexico.              The sedimentary layers become younger toward the coast             Some beds contain iron, lignite or uranium              The Sabine, Trinity, Brazos, Colorado, and Rio Grande rivers supply enormous  amounts of sand to deltas and barrier islands that characterize the Texas Gulf Coast e.g.  delta of the Rio Grande             The barrier islands are consequences of the relatively recent rise in sea level that  began about 18,000 years ago, at the end of the last Ice Age e.g. Padre has grown to a  length of 113 miles in the past 5,000 years, the country's longest continuous barrier.              Coastal subsidence and erosion is a recent problem e.g. coast along Highway 
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This note was uploaded on 01/27/2012 for the course GEOL 1420 taught by Professor Wagner during the Fall '10 term at Texas State.

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LANDFORMS OF TEXAS - LANDFORMSOFTEXAS I. Introduction

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