Desert similar. They occur in regions where large temperature differences occur between sea and land. Moist warm air rises over the land, deposits its water content and circulates back to sea. Further inland, areas receive very little precipitation. The Thar Desert near the India/Pakistan border is of this type. In some parts of the world, deserts are created by a rain shadow effect. Orographic lift occurs as air masses rise to pass over high ground. In the process they cool and lose much of their moisture by precipitation on the windward slope of the mountain range. When they descend on the
Thar Desert and water erosion, mining and other industries have resulted in serious land degradation. Agricultural production is mainly from kharif crops, which are grown in the summer season and seeded in June and July. These are then harvested in September and October and include bajra, pulses such as guar, jowar ("Sorghum vulgare"), maize ("zea mays"), sesame and groundnuts. Over the past few decades the development of irrigation features including canals and tube wells have changed the crop pattern with desert districts in Rajasthan now producing rabi crops including wheat, mustard and cumin seed along with cash crops. The Thar region of