Minerals and Energy Resources | Long Answer Type Questions

Long Answer Type Questions

Q.1 Explain the importance of minerals in the development of a country.

Answer: Minerals are important for country's development in many interconnected ways:

i) Minerals support industrial growth because they are essential raw materials for manufacturing, construction and transportation.

ii) They help in economic development as minerals like iron ore, coal and petroleum boost production and increase national income.

iii) Minerals create employment opportunities in mining, processing and related industries.

iv) They contribute to infrastructure development, especially in building roads, railways, power plants and factories.

v) Mineral exports bring foreign exchange, helping improve a country’s economy.

Q.2 Describe different methods of mineral formation with examples.

Answer: Minerals occur in mainly these below given forms.

i) Veins and Lodes: Igneous minerals form when molten magma cools and solidifies inside cracks and joints of rocks. These deposits are called veins (in small cracks) and lodes (in large cracks).
Examples: basalt, granite, tin, copper.

ii) Beds or Layers: Sedimentary minerals develop when sediments get compressed over long periods to form horizontal layers or beds.
Examples: coal, limestone, gypsum.

iii) Residual Mass: Chemical weathering breaks down rocks, and the soluble parts are washed away, leaving behind a residue containing valuable minerals.
Example: bauxite.

iv) Placer Deposits: Some heavy minerals settle at the bottom of river beds, valley floors or sands because they do not corrode in water. These concentrated deposits are called placer deposits.
Examples: gold, silver, tin, platinum.

v) Ocean Water and Ocean Beds: Minerals form in dry regions when water evaporates, creating deposits like salt and gypsum. Oceans also provide minerals dissolved in water, and ocean beds contain mineral nodules.
Examples: common salt, magnesium, bromine, manganese nodules.

Q.3 ‘Conservation of minerals is essential for sustainable development.’ Justify this statement with five arguments.

Answer: i) Minerals are non-renewable resources because they take millions of years to form, so careless use can lead to their complete exhaustion.

ii) Industries, transport and energy sectors depend heavily on minerals, so conserving them ensures long-term economic stability and growth.

iii) Overuse of minerals causes environmental damage such as land degradation, pollution and loss of biodiversity, making conservation necessary for ecological balance.

iv) Recycling and efficient use of minerals reduce pressure on mining, helping protect forests, soil and water bodies from mining-related impacts.

v) Conserving minerals ensures availability for future generations, which is the core idea of sustainable development—meeting today’s needs without harming tomorrow’s needs.

Q.4 Explain the different types of coal found in India. Describe any two major coal fields and their importance.

Answer: India has four main types of coal ; Anthracite, Bituminous, Lignite and Peat. Anthracite is the hardest coal with the highest carbon content but is found in very small quantities. Bituminous coal is the most widely used and is important for the iron and steel industry. Lignite is brown coal with high moisture, used mainly for power generation. Peat has very low carbon content and gives less heat.

Two important coalfields are Jharia in Jharkhand and Raniganj in West Bengal. Jharia is known for its high-quality coking coal, essential for steel production and supporting plants like Jamshedpur and Bokaro. Raniganj produces good bituminous coal used in industries and thermal power stations, making it crucial for electricity generation.

Q.5 Natural Gas is considered an environmental friendly fuel. Suggest and explain three ways to make it popular.

Answer: Natural gas is considered an environment-friendly fuel because it burns cleaner than other conventional fuels and releases very little smoke or harmful gases. To make it more popular, the government can expand the pipeline network so that households, industries and vehicles can easily access CNG and PNG. Second, public awareness campaigns should be conducted to inform people about its advantages, including lower pollution, safety and cost-effectiveness. Third, the government can provide incentives and subsidies on CNG vehicles, domestic connections and industrial use, encouraging people to shift away from petrol, diesel and coal. These steps can greatly increase the use of natural gas and help reduce environmental damage.

Q.6 Explain the need for developing non-conventional sources of energy in India. Describe any four such sources.

Answer: India needs to develop non-conventional sources of energy because conventional fuels like coal and petroleum are limited, polluting and unevenly distributed. These renewable sources help reduce environmental damage, cut dependence on costly imports and ensure long-term energy security for a growing population. They also support sustainable development by providing clean and reliable energy.

Four Non-Conventional Energy Sources are :

i) Solar Energy: It uses sunlight to generate electricity and heat through solar panels; clean and widely available.

ii) Wind Energy: It is produced by wind turbines in coastal and hilly areas; renewable and pollution-free.

iii) Biogas: It is made from animal waste and organic matter; useful for cooking, lighting and small-scale power generation.

iv) Geothermal Energy: It is obtained from heat inside the Earth; provides a steady and reliable energy supply.