Key Points
Key Points: Minerals
- Rocks are made of minerals; some rocks, like limestone, have one mineral, but most contain many minerals in different proportions.
- Though over 2000 minerals are identified, only a few are common and form most rocks.
- The properties of minerals (colour, hardness, crystal form, lustre, density) depend on the physical and chemical conditions of their formation.
- Geographers study minerals for their distribution and economic use, while geologists study their formation, age, and composition.
- Minerals are classified as metallic and non-metallic; ores are minerals from which metals are extracted (e.g., bauxite → aluminium).
Key Points: Distribution of Minerals in India
- Coal → Jharia (Jharkhand) – largest coalfield in India.
- Iron ore → Singhbhum (Jharkhand).
- Oil (onshore) → Digboi (Assam) – oldest oilfield in India.
- Oil (offshore) → Mumbai High (Arabian Sea) – largest domestic oil source.
- Map marking rule → Minerals are shown by small dots on maps.
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).
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.
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.
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.
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.
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).
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. |
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.
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.
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.
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.
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.
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.
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. |
Important Questions [18]
- Mention two ways in which hydroelectric power is better than nuclear power.
- Name the largest producing state of the following mineral and also give one use of the mineral: Manganese
- Name the largest coalfield of Chhattisgarh. State its importance.
- Answer the Following Question. Discuss Any Three Problems Associated with the Use of Thermal Power.
- Name any two river valleys responsible for the bulk production of coal in India.
- State the geographical condition favorable for the growth of tea.
- Name the major state in India and its one centre for the production of the following: Mica
- (I) Differentiate Between Metallic Minerals and Non-metallic Minerals. Give an Example of Each. (Ii) Which is the Leading State for Iron Ore Production in India?
- Name a major state for the development of the following: Thermal Power
- Name a major state for the development of the following: Hydroelectric Power.
- Name two centres in Chhattisgarh where the following is mined: iron ore
- Name two centers in Chhattisgarh where the following is mined: bauxite
- Name the largest producing state of the following mineral and also give one use of the mineral: Mica
- State any two advantages of hydel power over thermal power.
- State any two uses of manganese.
- State any two conditions that are favourable for generation of power from the energi; source shown above.
- Briefly discuss the significance of this energy source in ensuring sustainable development.
- State any two disadvantages of above fossil fuel.
