Through which landform feature do Narmada and Tapti rivers flow?
a) Delta
b) Rift Valley
c) Canyon
d) Flood Plain
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Answer: b) Rift Valley
Explanation
- Rift Valley: Both the Narmada and Tapti (Tapi) rivers flow westward through fault-trough formations known as rift valleys. These valleys were created by tectonic forces faulting the Earth’s crust:
- The Narmada flows through the rift valley bounded by the Vindhya Range to the north and the Satpura Range to the south.
- The Tapti flows through the rift valley situated south of the Satpura Range.
- Because they travel through these narrow, rocky linear troughs rather than soft alluvial plains, they do not carry large amounts of sediment to deposit at their mouths, causing them to form estuaries instead of deltas when entering the Arabian Sea.
Overview of Other Options
- a) Delta: A triangular wetland landform built by sediment deposition at the mouth of a slow-moving river as it enters a standing body of water (e.g., Sundarbans Delta formed by the Ganga and Brahmaputra).
- c) Canyon: A deep, narrow gorge with steep sides carved out by long-term river erosion (e.g., Grand Canyon of the Colorado River).
- d) Flood Plain: A flat, low-lying area of land adjacent to a river that periodically floods, receiving fertile silt deposits (e.g., the Indo-Gangetic Plains).
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