• Web Hosting
• Guestbooks
• Hit Counter
• Forums
• Blogs
• Mailing List
• Free Web Hosting

There are three principal landforms in the desert region i.e.

v The predominantly sand covered Thar
v Plains with hills including the central dune free country
v Hills

It is a desolate country where sand is piled up into huge wind blown dunes. The sand dunes are of three types viz., longitudinal parabolic, transverse and barchans. The first type, running NNE-SSW, i.e. parallel to the prevailing winds, occurs to the south and west of the Thar. The transverse dunes, aligned across the wind direction, to the east and north of Thar and barchans, with the conclave sides facing the wind in the interior, predominant in Central Thar. On the whole the Thar Desert slopes imperceptibly towards the Indus Plain and surface unevenness is mainly due to sand dunes. The dunes in the south are higher, rising sometimes to 152 m whereas in the north they are lower and rise to 16 m above the ground level. The Aravalli ranges form the main landmark to the south-east of Thar Desert. The more humid conditions that prevail near the Aravallis prevent the extension of Thar Desert towards the east and the Ganges Valley. In the heart of the sand covered area, the bare, dune free country of Barmer, Jaisalmer and Bikaner present an anomaly.

Desert soils
The soils of the Arid Zone are generally sandy to sandy-loam in texture. The consistency and depth vary according to the topographical features. The low-lying loams are heavier and may have a hard pan of clay, calcium carbonate or gypsum. The pH varies between 7 and 9.5. The soils improve in fertility from W & N.W. to E & N.E. Desert soils are Regosols of wind blown sand and sandy fluiratile deposits, derived from the disintegration of rock in the subjacent areas and blown in from the coastal region and the Indus valley. The desert soils occupy the districts of Jodhpur, Bikaner, Churu, Ganganagar, Barmer, Jaisalmer and Jalore. The Thar consists mainly of the wind-blown sand. The area is covered not only by sheet of sand but also of rockey projections of low elevations which constitute the older rocks of the country. Water is scarce and occurs at great depths, from 30 to 120 m from the ground level.

Some of these soils contain a high percentage of soluble salts in the lower horizons, turning water in the wells into poisonous. Being poor in organic matter they show a low loss on ignition. They contain varying amount of CaC03.

Index Pr1 Pr2 Pr3 Pr4page5

Fashion Designers fashion design flats apartment informations top ranking company pharmacy product information