Consider the following statements:

1.         Nilgiri in South India and Narmada valley are examples of rifts formed by faulting. 2.         Peninsular plateau is known as old topography, whereas Himalayas and Northern Plains are considered as new topographies. 3.         Brahmaputra river flows into Assam valley where it is known as Dihang gorge before making its way to Bangladesh.

Which of the statements given above are correct?

Statement 1: It is correct. Narmada valley in india lying between Vindhya and Satpura ranges is a rift valley resulted from the formation of block mountains. Similarly, Nilgiri in south are also examples of block mountains and Palghat gap is a low mountain pass which is a rift valley caused by subsidence between two parallel faults, i.e. between Nilgiri hills to the North and Anamalai hills to the South. Statement 2: It is correct. Peninsular Plateau is a tableland, composed of old crystalline, igneous and metamorphic rocks. It is considered as oldest land mass as it was formed due to the drifting of Gondwana land. Statement 3: It is incorrect. Brahmaputra is a transboundry river in Asia that cuts through 3 countries: China, India and Bangladesh. In all these countries, it is known by different names. It originates in Tibet (China), known as Tsangpo River, flows and enters into Arunachal Pradesh (India) where it is called Dihang or siang. Then, it flows further through Assam valley where it is known as Brahmaputra and enters Ramnabazar (Bangladesh) where its known as Jamuna. Hence, the correct option is 1.