<Li> The Bhabar belt--is adjacent to the foothills of the Himalayas and consists of boulders and pebbles which have been carried down by the river streams . As the porosity of this belt is very high, the streams flow underground . The bhabar is generally narrow about 7--15 km wide . </Li> <Li> The Terai belt--lies next to the Bhabar region and is composed of newer alluvium . The underground streams reappear in this region . The region is excessively moist and thickly forested . It also receives heavy rainfall throughout the year and is populated with a variety of wildlife . </Li> <Li> The Bangar belt--consists of older alluvium and forms the alluvial terrace of the flood plains . In the Gangetic plains, it has a low upland covered by laterite deposits . </Li> <Li> The Khadar belt--lies in lowland areas after the Bangar belt . It is made up of fresh newer alluvium which is deposited by the rivers flowing down the plain . </Li>

What is alluvial soil in the ganges plain and why do farmers like it