Minerals & Energy (Class 10)

Cheatsheet Content

### Minerals: An Introduction - **Definition:** A homogeneous, naturally occurring substance with a definable internal structure. Found in various forms in nature, from the hardest diamond to the softest talc. - **Importance:** Indispensable part of our lives. Everything we use, from a tiny pin to a towering building, is made from minerals. - **Development:** Used for industrial development, agriculture, defense, and even our food. - **Health:** Essential for human health (e.g., iron, calcium). - **Mode of Occurrence:** 1. **Igneous & Metamorphic Rocks:** - Found in cracks, crevices, faults, or joints. - Smaller occurrences: **veins**. Larger occurrences: **lodes**. - Formed when minerals in liquid/molten state are forced upwards through cavities towards the earth's surface. - Examples: Tin, copper, zinc, lead. 2. **Sedimentary Rocks:** - Occur in beds or layers. - Formed as a result of deposition, accumulation, and concentration in horizontal strata. - Examples: Coal, iron ore, gypsum, potash salt, sodium salt. 3. **Decomposition of Surface Rocks:** - Removal of soluble constituents, leaving a residual mass of weathered material containing ores. - Example: Bauxite (main ore of Aluminium). 4. **Alluvial Deposits (Placer Deposits):** - Occur as alluvial deposits in sands of valley floors and the base of hills. - Not corroded by water. - Examples: Gold, silver, tin, platinum. 5. **Ocean Waters:** - Vast quantities of minerals are found in ocean waters. - Examples: Common salt, magnesium, bromine. - Ocean beds are rich in manganese nodules. ### Types of Minerals - **Metallic Minerals:** Contain metal in raw form. - **Ferrous Minerals:** Contain iron. Account for about three-fourths of the total value of the production of metallic minerals. - **Iron Ore:** Basic mineral, backbone of industrial development. - **Magnetite:** Finest iron ore, 70% iron content, excellent magnetic qualities. - **Hematite:** Most important industrial iron ore, 50-60% iron content. - **Major belts in India:** Odisha-Jharkhand belt, Durg-Bastar-Chandrapur belt, Bellary-Chitradurga-Chikmagalur-Tumkur belt, Maharashtra-Goa belt. - **Manganese:** Used in manufacturing steel and ferro-manganese alloy. Required for manufacturing bleaching powder, insecticides, paints. Odisha is the largest producer. - **Non-Ferrous Minerals:** Do not contain iron. Vital for metallurgical, engineering, and electrical industries. - **Copper:** Malleable, ductile, good conductor. Used in electrical cables, electronics, chemical industries. Major producers: Balaghat (MP), Khetri (Rajasthan), Singhbhum (Jharkhand). - **Bauxite:** Ore from which Aluminium is obtained. Used in aircraft, utensils, electrical industries. Major producers: Amarkantak plateau, Maikal hills, Bilaspur-Katni region. Odisha is the largest producer. - **Non-Metallic Minerals:** Do not contain metal. - **Mica:** Plate-like sheets, excellent dielectric strength, low power loss factor, insulating properties, resistance to high voltage. Used in electrical and electronic industries. Major producers: Chota Nagpur plateau (Koderma-Gaya-Hazaribagh belt in Jharkhand), Ajmer (Rajasthan), Nellore (Andhra Pradesh). - **Limestone:** Basic raw material for cement industry, essential for iron & steel smelting. Found with calcium carbonates or magnesium carbonates. - **Rock Minerals:** Example: Limestone. ### Conservation of Minerals - **Necessity:** Minerals are non-renewable resources. They take millions of years to form and concentrate. The rate of consumption is much higher than the rate of formation. - **Consequences of Over-extraction:** Increased costs, environmental degradation, threat to future generations. - **Methods of Conservation (3 R's):** 1. **Reduce:** Minimize wastage in mining and processing. 2. **Reuse:** Recycle metals, use scrap metals. 3. **Recycle:** Use substitutes for scarce minerals (e.g., aluminium for copper, plastic for metal). - Improved technologies to utilize low-grade ores. ### Energy Resources: An Introduction - **Importance:** Essential for all economic activities. Required for industries, agriculture, transport, communication, and defense. Also needed for cooking, lighting, heating, and cooling. - **Classification:** 1. **Conventional Sources:** - Non-renewable (except hydro-electricity). - Examples: Coal, petroleum, natural gas, hydro-electricity, firewood, cattle dung cake. 2. **Non-Conventional Sources:** - Renewable. - Examples: Solar, wind, tidal, geothermal, biogas, atomic energy. ### Conventional Energy Sources #### Coal - **Formation:** Formed over millions of years from the compression of plant material. - **Types (based on carbon content):** - **Peat:** Lowest carbon content, low heating capacity, high moisture. - **Lignite:** Low grade brown coal, high moisture, used for electricity generation. Major reserves in Neyveli (Tamil Nadu). - **Bituminous:** Most popular coal, used in commercial use. Metallurgical coal is high-grade bituminous. - **Anthracite:** Highest quality hard coal, 80% carbon content. - **Major Coal Fields in India:** - **Gondwana Coal Fields:** Over 200 million years old. Damodar Valley (West Bengal-Jharkhand), Jharia, Raniganj, Bokaro, Godavari, Mahanadi, Son, Wardha valleys. - **Tertiary Coal Fields:** About 55 million years old. Meghalaya, Assam, Arunachal Pradesh, Nagaland. - **Importance:** Primary energy source in India, accounts for largest share of commercial energy consumption. #### Petroleum (Mineral Oil) - **Formation:** Occur in anticlines and fault traps, between porous and non-porous rocks. - **Importance:** Major fuel for transportation, provides raw material for petrochemical industries (fertilizers, synthetic rubber, synthetic fibres, medicines, plastics). - **Major Petroleum Producing Regions in India:** - **Mumbai High:** Offshore field. - **Gujarat:** Ankleshwar, Kalol, Mehsana, Naharkatiya. - **Assam:** Digboi, Naharkatiya, Moran-Hugrijan. - **Refineries:** Digboi, Noonmati, Bongaigaon (Assam); Barauni (Bihar); Mathura (UP); Panipat (Haryana); Jamnagar (Gujarat). #### Natural Gas - **Formation:** Found with petroleum deposits or separately. - **Importance:** Environmentally friendly fuel, raw material for petrochemical industry. CNG (Compressed Natural Gas) for vehicles. Power generation, fertilizer industry. - **Major Reserves in India:** Krishna-Godavari basin, Mumbai High, Gulf of Cambay, Andaman & Nicobar islands. - **Major Pipeline:** Hazira-Vijaipur-Jagdishpur (HVJ) gas pipeline. #### Hydro Electricity - **Formation:** Generated by fast-flowing water, which is a renewable resource. - **Importance:** Multipurpose projects (irrigation, power, flood control). - **Major Projects in India:** Bhakra Nangal, Damodar Valley, Kopili Hydel Project. #### Firewood & Cattle Dung Cake - Traditional non-commercial energy sources, mainly used in rural areas. - Leads to deforestation and reduced manure availability for agriculture. ### Non-Conventional Energy Sources - **Necessity:** Growing consumption of fossil fuels, environmental pollution, rising prices of oil and gas. - **Solar Energy:** - **India's Potential:** Tropical country, immense possibilities of harnessing solar energy. - **Applications:** Solar heaters, solar dryers, solar cookers, solar power plants. - **Advantage:** Reduces dependence on fossil fuels, environmentally friendly. - **Largest Solar Plant:** Madhapur (near Bhuj) for sterilization of milk cans. - **Wind Power:** - **India's Potential:** Has great potential, especially in Rajasthan, Gujarat, Tamil Nadu, Kerala, Maharashtra, and along the coast. - **Largest Wind Farm Cluster:** Nagercoil to Madurai (Tamil Nadu). - **Advantages:** Clean, renewable, no emissions. - **Biogas:** - **Formation:** Decomposition of organic matter (animal and human waste, farm waste) in biogas plants. - **Advantages:** Provides clean fuel for domestic use, produces high-quality manure. - **Benefits:** Reduces pressure on firewood, prevents loss of manure. - **Tidal Energy:** - **Mechanism:** Harnessing energy from ocean tides by building barrages at narrow openings of the sea. - **Potential in India:** Gulf of Kachchh (Gujarat), Ganga Delta (Sunderban regions of West Bengal). - **Geothermal Energy:** - **Mechanism:** Heat and steam from the Earth's interior used to generate electricity. - **Potential in India:** Parvati Valley near Manikaran (Himachal Pradesh), Puga Valley (Ladakh). - **Nuclear/Atomic Energy:** - **Mechanism:** Obtained by altering the structure of atoms (fission of uranium and thorium). - **Major Reserves in India:** Uranium: Jharkhand, Aravalli ranges (Rajasthan). Thorium: Monazite sands of Kerala. - **Nuclear Power Stations:** Tarapur (Maharashtra), Rawatbhata (Rajasthan), Kalpakkam (Tamil Nadu), Narora (UP), Kaiga (Karnataka), Kakrapar (Gujarat). ### Conservation of Energy Resources - **Necessity:** Limited conventional resources, increasing demand. - **Measures:** - Promote the use of non-conventional energy sources. - Greater use of public transport. - Switching off electricity when not needed. - Using power-saving devices. - Using non-conventional energy sources as much as possible. - **"Energy saved is energy produced."**