बिहार के अधिकांश भाग आच्छादित है - Most of Bihar is covered by - Bihar Ke Adhikansh Bhag Achhadit Hai Bihar Gk in hindi, Land and Soil Kachhari Mitti Se question answers in hindi pdf Laterite Mitti Se questions in hindi, Know About Parvatiya Mitti Se Bihar Gk online test Bihar Gk notes in hindi quiz book Kali Mitti Se