Minerals and Energy Resources · Class 10 Geography: quick revision, 70 bites

Why Minerals Matter

From a pin to a ship.

Nearly all we use — **a pin, a tall building, a large ship** — is made from minerals. Vehicles are made from them and **run on power derived from the earth**. Even **food** contains them.

Takeaway. Minerals are indispensable, not optional.

What a Mineral Is

Three properties in one sentence.

They range from the **hardest diamond** to the **softest talc**, because the physical and chemical conditions of formation vary.

Takeaway. Homogenous, natural, structured.

Geographer and Geologist

Same minerals, different questions.

Takeaway. Where it is, against what it is.

The Classification of Minerals

The chart the exercise depends on.

Takeaway. Ferrous means it contains iron.

What an Ore Is

Not every mineral is worth digging.

Takeaway. Geology decides the price of a mineral.

Veins and Lodes

Rising, cooling, solidifying.

Takeaway. The answer to how minerals form in igneous and metamorphic rocks.

Beds in Sedimentary Rocks

Layers, laid down over time.

Minerals occur in **beds or layers**, formed by deposition, accumulation and concentration in **horizontal strata**. **Coal and some iron ore** were concentrated under great heat and pressure.

Takeaway. Stratified minerals, and those left by drying.

The Residual Mass — Bauxite

What is left behind.

Takeaway. Bauxite is what weathering leaves.

Placer Deposits

Minerals water cannot dissolve.

Takeaway. Only water-resistant minerals survive in stream sand.

Minerals from the Ocean

Plenty there, little usable.

Ocean waters hold vast quantities of minerals, but most are **too widely diffused** to be of economic significance.

Takeaway. Quantity is not the same as usability.

Rat-Hole Mining

A tunnel a family digs.

Most minerals in India are **nationalised**. But in tribal areas of the **north-east** they are **owned by individuals or communities**. In **Jowai and Cherapunjee**, family members mine coal through a **long narrow tunnel** — **rat-hole mining**.

Takeaway. Community ownership, and a practice now banned.

An Uneven Endowment

Rich in the south, bare in the north.

Takeaway. Geological structure, processes and time explain the pattern.

What Makes a Deposit Worth Mining

When a reserve becomes a mine.

Takeaway. Three tests of economic viability.

Ferrous or Non-Ferrous?

The word decides the answer.

Takeaway. Check for iron before you classify.

Why Ferrous Minerals Matter

Three-fourths of the value.

Ferrous minerals make up **roughly three-quarters of the value** of metallic mineral production, and provide **a strong base for metallurgical industries**.

Takeaway. The iron-bearing minerals carry India's metal industry.

Magnetite and Hematite

Finest against most used.

Takeaway. Best quality and largest use are different ores.

Where Iron Ore Comes From

Four states, almost everything.

In **2018–19**, almost **97 per cent** of iron ore came from **Odisha, Chhattisgarh, Karnataka and Jharkhand** — just **3 per cent** from all other states.

Takeaway. Iron ore is heavily concentrated.

The Odisha–Jharkhand Belt

The eastern belt.

High grade hematite at the **Badampahar** mines in **Mayurbhanj and Kendujhar** (Odisha); haematite at **Gua and Noamundi** in **Singbhum** (Jharkhand).

Takeaway. Odisha and Jharkhand, side by side.

Bailadila and the Durg–Bastar–Chandrapur Belt

Fourteen super high grade deposits.

In **Chhattisgarh and Maharashtra**. The **Bailadila** hills of **Bastar** hold **14 deposits of super high grade hematite**, with **the best physical properties for steel making**.

Takeaway. The best steel-making ore in the chapter.

Kudremukh and the Karnataka Belt

Ore that flows through a pipe.

The **Ballari–Chitradurga–Chikkamagaluru–Tumakuru** belt has large reserves. **Kudremukh**, in the **Western Ghats**, is a **100 per cent export unit** and one of the **largest deposits in the world**.

Takeaway. Karnataka's ore goes straight to the sea.

The Maharashtra–Goa Belt

Lower grade, well used.

**Goa** and the **Ratnagiri** district of Maharashtra. The ores are **of no great quality**, but they are **worked efficiently** and exported through **Marmagao** port.

Takeaway. Efficiency makes up for grade.

Belts and Their Ports

Every belt has a way to the sea.

Takeaway. Exported ore needs a route out.

Manganese

The alloy mineral.

Takeaway. A small quantity, essential to steel.

Manganese by State, 2018–19

Read from the chapter's pie chart.

Takeaway. Madhya Pradesh leads, Maharashtra close behind.

Why Minerals and Steel Coincide

Lay the maps on top of each other.

The chapter asks you to superimpose the maps of **iron ore, manganese, coal and the iron and steel industry**.

Takeaway. Raw materials pull heavy industry toward them.

The Iron Ore Map Items

The five you must identify.

Takeaway. Two states hold four of the five.

Bellary or Ballari?

One place, two spellings.

The syllabus writes **Bellary**; your book and its map write **Ballari**. It is the same place in **Karnataka**.

Takeaway. A spelling difference, not a different mine.

Horse and Ox

Names shaped by the land.

Takeaway. Two mines named for how their hills look.

India's Non-Ferrous Position

Not very satisfactory — yet vital.

India's reserves and production of **non-ferrous minerals are not very satisfactory**.

Takeaway. Scarce, but essential.

Copper

The metal inside every wire.

Takeaway. Much needed, little found.

Where Copper Comes From

B-K-S.

Takeaway. Three states, three names.

From Bauxite to Aluminium

Clay first, metal last.

**Bauxite**, a **clay-like substance**, yields **alumina**, and then **aluminium**. It forms by decomposition of rocks rich in **aluminium silicates**.

Takeaway. Light and strong — that is aluminium's value.

Where Bauxite Is Found

Two-thirds from one state.

Mainly in the **Amarkantak plateau**, the **Maikal hills** and the plateau region of **Bilaspur–Katni**.

Takeaway. Odisha dominates bauxite.

Bauxite by State, 2018–19

Read from the chapter's pie chart.

Takeaway. Odisha alone outproduces the rest together.

Mica

A thousand sheets, a few centimetres.

Takeaway. Indispensable in electric and electronic industries.

Where Mica Is Found

The exercise answer.

On the **northern edge of the Chota Nagpur plateau**. The **Koderma–Gaya–Hazaribagh** belt of **Jharkhand** leads.

Takeaway. Koderma means mica.

Limestone

Cement and steel both need it.

Takeaway. Two industries rest on limestone.

Hazards to Miners

The cost paid underground.

Takeaway. A constant threat to those who dig.

Hazards to the Environment

The cost paid by the land.

**Water sources get contaminated**. **Dumping of waste and slurry** degrades **land and soil** and increases **stream and river pollution**.

Takeaway. Mining harms the region, not only the miner.

Why Minerals Must Be Conserved

One per cent of the crust.

Takeaway. Valuable, but short-lived possessions.

How to Conserve Minerals

T-R-S-S.

Takeaway. Plan and sustain, not just extract.

Napoleon's Aluminium

From the emperor's table to the beggar's bowl.

Soon after its discovery, **Napoleon III** served his most honoured guests on **aluminium**, and the rest on gold and silver.

Takeaway. A rare metal became an everyday one.

Conventional and Non-Conventional

Old sources and new ones.

Takeaway. Hydel is conventional, even though water is renewable.

Firewood and Dung Cake

Seventy per cent from two fuels.

They meet **more than 70 per cent** of rural household energy needs.

Takeaway. The village's fuel is running short.

Why Coal Matters

India's most abundant fossil fuel.

Coal provides a **substantial part** of India's energy — for **power generation**, **industry** and **domestic needs**.

Takeaway. Coal runs India's power and industry.

The Forms of Coal

Deeper, hotter, better.

Takeaway. Compression, depth and time decide the grade.

Gondwana and Tertiary Coal

200 million years against 55.

Takeaway. Older coal in the peninsula, younger in the north-east.

Why Industry Sits on Coalfields

Heavy fuel stays put.

Coal is **bulky** and **loses weight on use** as it turns to ash.

Takeaway. Moving coal far costs more than moving the factory.

Petroleum

The industry other industries feed on.

Takeaway. Oil powers and supplies.

How Oil Is Trapped

Oil at the top of the fold.

Takeaway. Porous below, sealed above.

Where Petroleum Is Produced

Three areas, one oldest.

**Mumbai High, Gujarat and Assam**. **Ankeleshwar** is Gujarat's most important field.

Takeaway. West coast, Gujarat, Assam.

Natural Gas

Found with oil, used everywhere.

Takeaway. A fuel and a raw material at once.

The HVJ Pipeline

From 1,700 km to 18,500.

GAIL's **1,700 km Hazira–Vijaipur–Jagdishpur** pipeline linked **Mumbai High and Bassein** gas fields with **fertiliser, power and industrial** complexes in **western and northern India**.

Takeaway. One pipeline started a national grid.

Hydel and Thermal

Same electricity, different source.

Takeaway. Once generated, electricity is exactly the same.

The Energy Map Items

Thirteen places, three tasks.

Takeaway. Know each place's state and type.

Syllabus Spelling and Book Spelling

Same places, different spellings.

Takeaway. Recognise both.

Why Look Beyond Fossil Fuels

Costly, uncertain, polluting.

Takeaway. Security, cost and environment all point the same way.

Nuclear Energy

Energy from inside the atom.

Takeaway. Kerala's sands mean thorium.

The Nuclear Map Items

Four to locate and label.

Takeaway. North, two in the west, south.

Rawat Bhata and Kaiga

Six on the map, four in the syllabus.

The book's map shows **Rawat Bhata** and **Kaiga** as well. They are real stations, but **not prescribed** for map work.

Takeaway. Learn the four the syllabus names.

Solar Energy

A tropical advantage.

As a **tropical country**, India has enormous solar potential. **Photovoltaic technology** turns sunlight **directly into electricity**, and it is popular in **rural and remote areas**.

Takeaway. Sunlight replaces firewood.

Wind Power

Nagarcoil to Madurai.

The **largest wind farm cluster** runs from **Nagarcoil to Madurai** in Tamil Nadu. Gujarat, Maharashtra, Karnataka, Andhra Pradesh, Kerala and Lakshadweep have major wind farms.

Takeaway. Tamil Nadu leads in wind.

Biogas

Waste into fuel.

Takeaway. Better heat than the old fuels.

The Twin Benefits of Biogas

Energy and manure together.

Takeaway. By far the most efficient use of cattle dung.

Tidal Energy

Power from the rise and fall of the sea.

**Floodgate dams** trap water at high tide; when the tide falls, it flows back **through a turbine** to the sea.

Takeaway. Gujarat's gulfs and Bengal's delta.

Geothermal Energy

Steam from underground.

Where the **geothermal gradient is high**, groundwater heated by shallow rocks rises as **steam** to drive turbines. India has **several hundred hot springs**.

Takeaway. Two experiments in the Himalaya.

Why Conserve Energy

Every sector runs on it.

Energy is **a basic requirement for economic development** — agriculture, industry, transport, commercial and domestic sectors all need it, and consumption keeps **rising**.

Takeaway. Rising need, poor efficiency.

The Twin Planks

Two planks hold up sustainable energy.

Takeaway. Use less, and use renewable.

Saving Energy as a Citizen

What you can do today.

Takeaway. Small habits add up.

Energy Saved Is Energy Produced

A line worth quoting.

The chapter closes its energy section with this slogan.

Takeaway. Saving counts as producing.