<sod>Bihar is in [[Indo-Gangetic plain]] so naturally fertile soil<ref name="agron.scijournals.org">http://agron.scijournals.org/cgi/content/abstract/64/3/336</ref> is one asset of the state. Thus Indo-Gangetic plain's soil is the backbone of agricultural and industrial development. The Indo-Gangetic plain in Bihar consists of a thick alluvial mantle of drift origin overlying in most part. The [[siwalik]] and older tertiary [[Rock (geology)|rock]]s. The soil is mainly young loam rejuvenated every year by constant deposition of silt, clay and sand brought by streams but mainly by [[floods in Bihar]]<ref>{{Citation<eod>
<sod>Bihar is in [[Indo-Gangetic plain]] so naturally fertile soil<ref name="agron.scijournals.org">http://agron.scijournals.org/cgi/content/abstract/64/3/336</ref> is one asset of the state. Thus Indo-Gangetic plain's soil is the backbone of agricultural and industrial development. The Indo-Gangetic plain in Bihar consists of a thick alluvial mantle of drift origin overlying in most part. The [[siwalik]] and older tertiary [[Rock (geology)|rock]]s. The soil is mainly little young loam rejuvenated every year by constant deposition of silt, clay and sand brought by streams but mainly by [[floods in Bihar]]<ref>{{Citation<eod>