Understanding River Deltas
A delta is a landform created by deposition of sediment that is carried by a river as the flow leaves its mouth and enters slower-moving or standing water. Rivers that form deltas typically carry significant amounts of sediment and flow relatively slowly as they approach the sea, allowing sediment to build up.
Indian Rivers and Delta Formation
- East-flowing rivers in India, such as the Cauvery, Godavari, and Krishna, generally form large deltas. These rivers traverse long distances across the plains, carrying substantial sediment load before emptying into the Bay of Bengal.
- West-flowing rivers, including the Narmada and Tapti, flow through steep terrains and empty into the Arabian Sea.
Why Narmada Does Not Form a Delta
- The Narmada river is a West-flowing river.
- It flows through a rift valley and has a steep gradient near its mouth.
- Instead of a delta, the Narmada forms an estuary where its freshwater mixes with the saltwater of the Arabian Sea. Estuaries are funnel-shaped tidal mouths of rivers, often deeper than deltas, and do not involve significant land formation at the mouth.
Therefore, the Narmada is the river among the options that does not form a delta.
Important Questions from Current Affairs
What are the advantages of fertigation in agriculture ?
1. Controlling the alkalinity of irrigation water is possible.
2 Efficient application of Rock Phosphate and all other phosphatic fertilizers is possible.
3. Increased availability of nutrients to plants is possible.
4. Reduction in the leaching of chemical nutrients is possible.
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Consider the following minerals:
1. Bentonite
2. Chromite
3. Kyanite
4. Sillimanite
In India, which of the above is/are officially designated as major minerals?
With reference to Ocean Mean Temperature (OMT), which of the following statements is/are correct?
1. OMT is measured up to a depth of 26°C isotherm which is 129 meters in the south-western Indian Ocean during January - March
2. OMT collected during January - March can be used in assessing whether the amount of rainfall in monsoon will be less or more than a certain long-term mean.
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With reference to chemical fertilizers in India, consider the following statements :
1. At present, the retail price of chemical fertilizers is market-driven and not administered by the Government.
2. Ammonia, which is an input of urea, is produced from natural gas.
3. Sulphur, which is a raw material for phosphoric acid fertilizer, is a by-product of oil refineries.
Which of the statements given above is/are correct?
With reference to India's Desert National Park, which of the following statements are correct?
1. It is spread over two districts.
2. There is no human habitation inside the Park
3. It is one of the natural habitats of Great Indian Bustard.
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