Revision summary
The shelf is the shallow seabed around India and the islands. Mumbai High is the principal offshore oil example on the western shelf. The KG basin is the principal eastern gas example, with a mixed production history. Kerala–Tamil Nadu–Odisha placers hold ilmenite, rutile, zircon, and monazite. Gas hydrates are still largely prospective. Ecology and UNCLOS rights condition what can actually be lifted.
Model answer
Introduction
The continental shelf is the shallow seabed around the peninsula and the islands. It does hold minerals and energy, and a critical examination must separate producing fields from hopeful maps.
Body
Energy on the shelf
- Mumbai High, discovered in 1974, is the main example of offshore petroleum on India’s western shelf.
- The Krishna–Godavari basin on the eastern shelf has gas and oil in deeper water, including the KG-D6 field, which showed both promise and later decline.
- Coal-bed and gas-hydrate prospects have been surveyed on the shelf and slope; hydrate is still largely a research resource, not a producing one.
- Offshore wind is an energy use of the shelf surface, not a mineral, but it is part of the same maritime energy store.
Minerals
- Placers of heavy minerals such as ilmenite, rutile, zircon, and monazite occur in Kerala, Tamil Nadu, and Odisha beach and nearshore sands.
- Phosphorite and some polymetallic signs are reported on parts of the western shelf, with more nodule interest on the deep ocean floor beyond the shelf.
- Construction sand and lime shell have been taken from some nearshore areas, which is a mineral use with high ecological cost.
Critical examination
- The statement is true for petroleum, gas, and heavy-mineral sands that are already produced.
- It is only partly true for hydrates and many phosphorite maps, which remain prospective.
- Storms, coral, turtle nesting, and fishery grounds limit where extraction is wise, so a storehouse is not an open warehouse.
- UNCLOS gives a coastal state sovereign rights over shelf resources, and India has submitted extended-shelf claims, which is law, not yet extra oil in the tank.
Examples to keep
- Mumbai High shows a real energy store.
- Chavara and Manavalakurichi sands show a real mineral store.
- KG basin shows that a store can decline if geology and management disappoint.
Flow diagram
flowchart TD S[Continental shelf] --> E[Mumbai High KG gas] S --> M[Heavy mineral sands] S --> P[Hydrates prospective] E --> C[Ecology and cost]
Conclusion
India’s continental shelf is a storehouse of petroleum, gas, and heavy-mineral sands in proven belts. The statement becomes weak if it treats hydrates and every map anomaly as the same as Mumbai High, or if it ignores fishery and reef limits on extraction.
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Differentiate between frontiers and boundaries and present a detailed account on the types of boundaries giving suitable examples from the Indian subcontinent.
Next question in the 2025 paper (Q20). View answer →
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Is the deep ocean the same as the continental shelf?
No. The shelf is the shallow submerged margin. Nodules of the deep ocean floor lie beyond it, in a different legal and technical zone.
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Does a storehouse mean easy extraction?
No. Cost, storms, reefs, and fisheries decide what is lifted. Prospective hydrates are not yet a store in production.
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