Khadir or Khadar plains are those that are low-lying next to a river. Khadir areas are prone to flooding and sometimes include portions of former river beds that became available for agriculture when a river changed course. Khadir soil consists of new alluvial deposits and is often very fertile.

Correct Option: A

Khadir or Khadar plains are those that are low-lying next to a river. Khadir areas are prone to flooding and sometimes include portions of former river beds that became available for agriculture when a river changed course. Khadir soil consists of new alluvial deposits and is often very fertile.

Khetri Nagar is a town in Jhunjhunu district of Rajasthan in India. It is part of Shekhawati region. Khetri is actually two towns, the first "Khetri Town" was founded by Raja Khet Singhji Nirwan.

Correct Option: A

Khetri Nagar is a town in Jhunjhunu district of Rajasthan in India. It is part of Shekhawati region. Khetri is actually two towns, the first "Khetri Town" was founded by Raja Khet Singhji Nirwan.

Area: 9,706,961 km². With an area of about 9.6 million km² , the People's Republic of China is the 3rd largest country in total area behind Russia and Canada, and very similar to the United States.

Correct Option: B

Area: 9,706,961 km². With an area of about 9.6 million km² , the People's Republic of China is the 3rd largest country in total area behind Russia and Canada, and very similar to the United States.

The rocks of the Dharwar system are mainly sedimentary in origin, and occur in narrow elongated synclines resting on the gneisses found in Bellary district, Mysore and the Aravalis of Rajputana. These rocks are enriched in manganese and iron ore which represents a significant resource of these metals.

Correct Option: B

The rocks of the Dharwar system are mainly sedimentary in origin, and occur in narrow elongated synclines resting on the gneisses found in Bellary district, Mysore and the Aravalis of Rajputana. These rocks are enriched in manganese and iron ore which represents a significant resource of these metals.

Digboi is a town and a town area committee in Tinsukia district in the north-eastern part of the state of Assam, India. Crude oil was discovered here in late 19th century.

Correct Option: D

Digboi is a town and a town area committee in Tinsukia district in the north-eastern part of the state of Assam, India. Crude oil was discovered here in late 19th century.