Explanations:Umarangsho, located in the Dima Haso area of Assam, is renowned for its limestone deposits. Limestone is a sedimentary rock composed primarily of calcium carbonate (CaCO₃). It is formed over millions of years from the accumulation of marine organisms' shells and skeletons, which are rich in calcium carbonate. The process of limestone formation involves the deposition of these materials in marine environments, followed by compaction and cementation over geological time scales.
Limestone has a wide range of applications in various industries. In construction, it is used as a building material and as a component in the production of cement and concrete. In agriculture, limestone is used to neutralize acidic soils and improve soil fertility. Additionally, it is used in the manufacturing of glass, paper, and pharmaceuticals. The presence of limestone in Umarangsho makes it an economically significant area, as the mineral is a valuable resource for local and regional industries.
It is important to distinguish between limestone and other mineral resources. For instance, coal is a different type of sedimentary rock formed from the remains of ancient plants, and it is primarily used as a fuel source. Petrol, on the other hand, is a refined product of crude oil, which is a liquid fossil fuel. Cement is a manufactured product that requires limestone as one of its key raw materials, but the region is specifically known for its limestone deposits rather than cement production.
Understanding the geographical and economic significance of mineral resources in specific regions is crucial for competitive examinations such as the UPSC, SSC, and State PSC. These examinations often test knowledge of regional geography, mineral resources, and their economic implications. Therefore, recognizing that Umarangsho in Dima Haso is famous for its limestone deposits is an important piece of information for candidates preparing for such exams.