Limestone is an essential raw material for both the cement industry and the iron-smelting process in blast furnaces. Using your understanding of how limestone is formed and where it occurs geologically, explain why limestone is widely available across India, and why it makes economic sense to locate cement plants close to limestone deposits.
Generated by claude-sonnet-4-6 · 2026-06-26 13:34 · grounding rag
Model Answer
Limestone is a sedimentary rock formed by deposition and accumulation in horizontal strata over millions of years. Since large parts of India have sedimentary rock formations, limestone deposits are widespread across the country.
Because limestone is a heavy, bulky raw material, transporting it over long distances increases production costs significantly. Locating cement plants near limestone deposits reduces transportation costs, making cement production economically viable. This is similar to how coal-based industries are set up near coalfields to minimise costs and maximise efficiency.
Source: Chapter 5 — Minerals and Energy Resources, Mode of Occurrence of Minerals (sedimentary rocks section)
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Explanation
- Key link to mark: Examiners expect three clear points — (1) limestone is sedimentary in origin, (2) sedimentary rocks are widely found in India, and (3) proximity reduces transport cost/improves economic viability.
- The passage explicitly states minerals in sedimentary rocks occur in beds/layers due to deposition — use this to explain wide availability.
- The passage also notes "closeness to the market" and ease of extraction affect economic viability — apply this logic to cement plants near deposits.
- Avoid writing general facts about cement; stay focused on geological formation and economic reasoning as asked.