मराठी
CISCEISC (Arts) Class 12
प्रश्नपत्रिका३७२
पाठ्यपुस्तक उत्तरे१६६८१
महत्वाचे प्रश्न आणि उत्तरे५८७१
संकल्पना स्पष्टीकरण आणि व्हिडिओ९५३
टाइम टेबल१५
अभ्यासक्रम

Overview of Minerals and Power Resources

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Estimated time: 42 minutes
CISCE: Class 12

Key Points: Minerals in India

  • Meaning of Mineral – A mineral is a natural substance with definite chemical and physical properties.
  • Types of Minerals – Two main types:
    i. Metallic minerals (contain metals – ferrous and non-ferrous)
    ii. Non-metallic minerals (organic like coal, petroleum; inorganic like mica, limestone)
  • Characteristics of Minerals –
    i. Unevenly distributed
    ii. Good quality minerals are limited in quantity
    iii. Exhaustible resources (cannot be replaced quickly)
  • Mining & Conservation – Minerals take millions of years to form and once used, are lost forever. Hence, mining is called a “robber industry” and minerals must be conserved.
  • Minerals in India – India is rich in iron ore, manganese, mica and limestone, but deficient in copper, lead, zinc and petroleum. It is strong in atomic minerals like uranium and thorium.
CISCE: Class 12

Key Points: Distinction between Metallic and Non-metallic Minerals

Metallic Minerals Non-Metallic Minerals
Contain metals (e.g., iron, copper, manganese). Do not contain metals.
Generally hard and shiny. Usually have little or no shine.
Mostly found in igneous rocks. Mostly found in sedimentary rocks.
Do not break easily when hit. Break into pieces when hit.
Ductile and malleable. Not ductile or malleable.
CISCE: Class 12

Key Points: Distinction between Ferrous and Non-ferrous Minerals

Ferrous Minerals Non-Ferrous Minerals
Contain iron and are mainly used in the iron and steel industry. Do not contain iron (e.g., gold, copper, lead).
Generally grey in colour and form the base of machinery. Have different colours and are important for economic growth.
Mostly found in crystalline rocks. Found in almost all types of rocks.
CISCE: Class 12

Key Points: Distribution of Minerals

  • Uneven Distribution – Minerals are unevenly distributed and mostly found in older rock formations of the Peninsular Plateau.
  • Northern Plains & Himalayas – Northern Plains are poor in minerals due to thick alluvial cover. The Himalayas have minerals but are not rich due to complex structure.
  • North-Eastern Plateau – The richest mineral belt (Chotanagpur Plateau). It has iron ore, coal, manganese, mica and bauxite.
  • Southern-Western Plateau – Includes Karnataka and Tamil Nadu. It has iron ore, manganese and bauxite but lacks coal.
  • Western & Other Belts – Gujarat and Rajasthan have petroleum, natural gas and non-ferrous metals. Offshore oil is found near Mumbai (Mumbai High).
CISCE: Class 12

Key Points: Metallic Minerals > Iron Ore

  • Importance – Iron ore is the backbone of modern industry and is essential for the iron and steel industry.
  • Types of Iron Ore –
    -Magnetite (best quality, 72% iron)
    -Haematite (60–70% iron, most important in India)
    -Limonite (40–60% iron)
    -Siderite (low quality, 40–50% iron)
  • Major Producing States – Odisha (largest producer), Chhattisgarh, Karnataka and Jharkhand.
  • Production & Export – India is one of the leading producers and exports iron ore mainly to Japan, South Korea and European countries.
  • Main Mining Areas – Important belts are located in Odisha–Jharkhand belt, Durg–Bastar–Chandrapur belt and Bellary–Chitradurga belt.
CISCE: Class 12

Key Points: Metallic Minerals > Mica

  • Importance – Mica is a valuable non-metallic mineral used in electrical and electronic industries due to its insulating properties.
  • Types – The three main types found in India are muscovite, phlogopite and biotite.
  • Major Producing States – Andhra Pradesh (largest producer), followed by Rajasthan, Odisha and Bihar.
  • Production Trend – India once had monopoly in mica production, but output has declined due to reduced demand and use of substitutes.
  • Export – India exports a large share of its mica to countries like Japan, USA, UK and Germany.
CISCE: Class 12

Key Points: Bauxite

  • Importance – Bauxite is the main raw material used for making aluminium.
  • Nature – It is a rock made mainly of hydrated aluminium oxides.
  • Appearance – It is clay-like in texture.
  • Colour – Its colour may be pinkish, reddish or whitish depending on iron content.
  • Industrial Use – It is essential for aluminium industry and related manufacturing.
CISCE: Class 12

Key Points: Power Resources

  • Meaning – Power or energy is essential for production, transport, communication and daily life.
  • Importance – Economic development and standard of living depend on the availability of reliable and affordable energy.
  • Non-Renewable Energy – These resources cannot be easily replaced and get exhausted (e.g., coal, petroleum, natural gas).
  • Renewable Energy – These resources can be renewed naturally (e.g., solar, wind, tidal, geothermal and hydroelectric energy).
  • Conventional & Non-Conventional – Coal and petroleum are conventional sources, while solar, wind and biogas are non-conventional sources.
CISCE: Class 12

Key Points: Conventional Sources of Energy > Coal

  • Meaning – Coal is an inflammable fossil fuel mainly made of carbon. It is used for power generation and in industries.
  • Importance – It supplies about 60% of India’s commercial energy and is called “black gold” due to its high economic value.
  • Origin – Coal was formed from buried forests during the Carboniferous Age under high heat and pressure over millions of years.
  • Types of Coal –
    i. Anthracite – Best quality (over 80% carbon).
    ii. Bituminous – Most widely used in India.
    iii. Lignite – Lower grade, brown coal.
    iv. Peat – First stage of coal formation.
  • Coal Fields in India – Two main types:
    Gondwana Coal Fields (major share of reserves and production).
    Tertiary Coal Fields (mainly in north-eastern states).
  • Major Producing States – Jharkhand, Chhattisgarh, Odisha, West Bengal and Madhya Pradesh produce most of India’s coal.
  • Lignite Production – Tamil Nadu is the leading producer of lignite in India, followed by Gujarat and Rajasthan.
CISCE: Class 12

Key Points: Conventional Sources of Energy > Oil and Natural Gas

  • Petroleum (Oil) is an important source of energy found in sedimentary basins, both onshore and offshore.
  • Major oil-producing regions in India are Mumbai High (offshore), Rajasthan, Gujarat, Assam and Krishna-Godavari basin.
  • Mumbai High is the largest oil-producing area in India.
  • India’s oil production is not sufficient; therefore, the country imports a large quantity of petroleum.
  • Natural Gas is an important commercial fuel and cleaner than coal and petroleum.
  • Major natural gas areas include Krishna-Godavari basin, Mumbai offshore, Assam and Rajasthan.
  • Natural gas is transported through pipelines and is used for power generation, fertilizers and domestic cooking (LPG).
CISCE: Class 12

Key Points: Power Generation in India

  • Importance – Power is essential for economic development, industries and improving standard of living.
  • Sources of Power – India uses coal, petroleum, natural gas (fossil fuels), hydro power, nuclear power and renewable sources like solar and wind.
  • Thermal Power – It is the major source of electricity in India (about 70–75%), mainly using coal.
  • Hydroelectric Power (HEP) – Developed in mountainous regions; important in northern and north-eastern India. It is renewable but its share has declined.
  • Growth in Capacity – Installed power capacity has increased greatly since Independence due to Five Year Plans and new projects.
  • Regional Distribution – Power generation is uneven; more developed in industrial states and near coalfields.
  • Electricity Consumption Pattern – Industries use the largest share of electricity, followed by agriculture and domestic sector.
CISCE: Class 12

Key Points: Important Hydroelectric Plants in Different States of India

  • Jammu & Kashmir – Lower Jhelum, Salal, Dulhasti and Baglihar projects.
  • Punjab & Himachal Pradesh – Bhakra-Nangal (Satluj), Pong, Nathpa-Jhakri and other major projects.
  • Uttarakhand & Uttar Pradesh – Tehri (Bhagirathi), Rihand and Obra projects.
  • Rajasthan & Madhya Pradesh – Rana Pratap Sagar and Jawahar Sagar (Chambal); Gandhi Sagar and Bargi (Narmada).
  • Eastern India (Bihar, Jharkhand, West Bengal, Odisha) – Kosi; Damodar Valley projects (Maithon, Panchet, Tilaiya); Hirakud (Mahanadi).
  • Southern India (Karnataka, Kerala, Tamil Nadu, Andhra Pradesh, Telangana) – Sharavathi, Idukki, Mettur, Srisailam and Nagarjuna Sagar projects.
  • Western & North-Eastern States – Ukai (Gujarat), Koyna (Maharashtra); Loktak (Manipur) and other projects in Assam and Arunachal Pradesh.
CISCE: Class 12

Key Points: Nuclear Power

  • Beginning in India – Nuclear power programme started after Independence; first nuclear plant was set up at Tarapur (1969).
  • Major Nuclear Plants – Located at Rawatbhata (Rajasthan), Kalpakkam (Tamil Nadu), Narora (U.P.), Kaiga (Karnataka), Kakrapar (Gujarat) and Kudankulam (Tamil Nadu).
  • Contribution – Nuclear power forms a small share (around 2–3%) of India’s total electricity generation.
  • Advantages – It is a cleaner source compared to coal and does not produce smoke during operation.
  • Environmental Risks – Nuclear plants can cause serious damage if leakage occurs (e.g., Chernobyl disaster); large dams for hydropower also cause displacement and ecological damage.
CISCE: Class 12

Key Points: Non-Conventional Sources of Energy

  • Meaning – These are renewable and inexhaustible sources of energy like solar, wind, geothermal and biogas.
  • Solar Energy – India receives abundant sunlight. It is used for cooking, heating and electricity through solar panels.
  • Wind Energy – Developed mainly in Tamil Nadu, Gujarat, Maharashtra and Odisha; used for electricity and water pumping.
  • Geothermal Energy – Produced from heat inside the earth; projects are being developed at Manikaran (Himachal Pradesh).
  • Biogas – Important in rural areas; used for cooking and lighting. It also produces manure and improves sanitation.
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