1. The credit for initiating modern industrialization goes to coal energy resources.

2. Coal is a solid organic substance which is used as fuel. Coal is very important as a major source of energy. 35% to 40% of the total energy used comes from coal. Other combustible and useful substances are also obtained from coal.

1. The Indo-Gangetic plain, where the internal flow reemerges, is locally known as the Terai region. It is a low-lying area with fertile soils to the north of the Indo-Gangetic plain.

2. The Terai region has been formed from the sediments of the rivers originating from the Himalayas. These rivers enter the plains after emerging from the Himalayas and bring with them a huge amount of sediment. These sediments accumulate in the northern part of the plain and form the Terai region.