CBSE Class 10 · Social Science · board exam 2027
Chapter 5: Minerals and Energy Resources — notes
The chapter’s 8 parts in the book’s order — the first idea of each and the points Medha Ma’am writes on the board — and the summary at the end. The full lesson and a check question for each part are in the app.
1. What is a mineral and how are minerals found?
Okay, so think about this — you actually use minerals every single day, even if you never notice it.
- • Mineral = homogenous, naturally occurring substance with a definable internal structure
- • Properties used to classify: colour, hardness, crystal form, lustre, density
- • Ore = accumulation of mineral mixed with other elements
- • Must be concentrated enough to extract commercially
2. How minerals occur in nature
Okay, so minerals don't all form the same way.
- • Veins/lodes: igneous & metamorphic rocks - tin, copper, zinc, lead
- • Beds/layers: sedimentary rocks - coal, iron ore, gypsum, potash, sodium salt
- • Residual decomposition: Bauxite
- • Placer deposits: sands of valley floors - gold, silver, tin, platinum
- • Ocean water: common salt, magnesium, bromine
3. Ferrous minerals: Iron ore and Manganese
Okay, so let's talk about ferrous minerals.
- • Ferrous minerals = 3/4 value of metallic mineral production
- • Magnetite: up to 70% iron, best magnetic quality
- • Hematite: 50-60% iron, most used industrially
- • Iron belts: Odisha-Jharkhand, Durg-Bastar-Chandrapur, Ballari-Chitradurga-Chikkamagaluru-Tumakuru, Maharashtra-Goa
- • Manganese: 10 kg needed per tonne of steel
4. Non-ferrous and non-metallic minerals
Non-ferrous minerals include copper, bauxite, lead, zinc and gold, and though India's reserves are not very satisfactory, these minerals are vital for metallurgical, engineering and electrical industries.
- • Non-ferrous: copper, bauxite, lead, zinc, gold
- • Copper: malleable, ductile, good conductor - cables, electronics
- • Bauxite -> aluminium: strong + light + conductive + malleable
- • Mica: splits into thin sheets, dielectric strength - electric industry
- • Limestone: raw material for cement, used in smelting iron ore
5. Hazards of mining and conserving minerals
Okay, so, mining isn't free of cost.
- • Mining hazards: pulmonary disease, mine roof collapse, inundation, fire
- • Water contamination, land degradation, river pollution
- • Minerals = finite, non-renewable (only 1% of earth's crust is workable)
- • Conservation: low grade ore technology, recycling, scrap metal, substitutes
6. Conventional energy sources: Coal, Petroleum, Natural Gas, Electricity
Okay, so we need energy — to cook, to light our homes, to run vehicles.
- • Coal forms: Peat -> Lignite -> Bituminous -> Anthracite (highest quality)
- • Gondwana coal: ~200 million yrs (Damodar valley - Jharia, Raniganj, Bokaro)
- • Tertiary coal: ~55 million yrs (Meghalaya, Assam, Arunachal, Nagaland)
- • Petroleum: found in anticlines & fault traps (Mumbai High, Gujarat, Assam)
- • Natural gas: with petroleum, used as CNG/PNG (Mumbai High, Cambay, Krishna-Godavari)
- • Electricity: Hydro (renewable) + Thermal (non-renewable fossil fuels)
7. Non-conventional energy sources
Okay, so fossil fuels are limited, and they cause pollution too.
- • Nuclear: Uranium, Thorium (Jharkhand, Aravalli, Monazite sands of Kerala)
- • Solar: photovoltaic technology converts sunlight to electricity
- • Wind: largest cluster Tamil Nadu (Nagarcoil to Madurai)
- • Biogas: organic waste -> gas; cattle dung plants = 'Gobar gas plants'
- • Tidal: floodgate dams (Gulf of Khambhat, Gulf of Kuchchh)
- • Geothermal: hot groundwater -> steam -> turbines (Manikaran, Puga Valley)
8. Conserving energy resources
Okay, so think about it — every sector needs energy.
- • Every sector needs energy: agriculture, industry, transport, domestic
- • India: one of least energy efficient countries
- • Conserve by: public transport, switching off lights, power-saving devices, non-conventional energy
- • 'Energy saved is energy produced'
Summary
Okay, so let's look back at everything we covered. We started with minerals — homogenous, naturally occurring substances, each with a definable internal structure. You learned they're found in ores, formed in different ways — veins and lodes, sedimentary beds, decomposition, placer deposits, and even ocean water. Then we looked at ferrous minerals, like iron ore and manganese. After that came non-ferrous and non-metallic minerals — copper, bauxite, mica, and limestone — along with their uses and where they're mined in India. You also saw the hazards mining brings, both to miners and to the environment. And since minerals are finite and non-renewable, you understood why we must conserve them, through recycling and better technology. Then we moved to energy. First, the conventional sources — coal, in its various forms, petroleum, natural gas, and electricity — and where they occur across India. Finally, you learned about non-conventional sources — nuclear, solar, wind, biogas, tidal, and geothermal energy. And why conserving energy matters for sustainable development. Now tell me — out of everything we covered today, which topic did you find the most interesting?
AskMedha · Medha Ma’am — CBSE Class 10 Social Science, Chapter 5. Written from the textbook, checked twice.
Questions parents and students ask
- How do I get the "Minerals and Energy Resources" notes as a PDF?
- Press "Save as PDF" — the phone’s print sheet opens; choose "Save as PDF" there. The PDF holds the notes only.
- Where are these notes written from?
- From the chapter’s own textbook text, part by part, in the book’s own terms; a second, independent model then checked every part against the book. The full lesson, a check question for each part and the practice are in the AskMedha app.
The same preparation, with Medha Ma’am — on your phone
Every question of every chapter with its model answer, practice questions in the board’s own shapes, 60 minutes of class a day, written answers marked, a test every Sunday and a WhatsApp report to parents.
Medha Ma’am is an AI teacher, not a live tutor. Every answer is checked twice; a person takes responsibility.