In-Text Activities & Margin Questions
Q1. We use different things in our daily life made from metal. Can you list a number of items used in your house made of metals. Where do these metals come from?
Answer:
Items made of metals in our houses and their raw mineral sources are listed below:
| Household Item | Metal Used | Mineral Source / Ore |
|---|---|---|
| Utensils, pressure cookers | Aluminium, Stainless Steel | Bauxite (for Aluminium); Iron ore, Chromium, Nickel (for Steel) |
| Electrical wiring, fan motors | Copper, Aluminium | Copper ore (Chalcopyrite), Bauxite |
| Door handles, window frames | Brass, Aluminium, Iron | Copper & Zinc (for Brass), Bauxite, Iron ore |
| Jewellery | Gold, Silver | Placer deposits, Native Gold/Silver ores |
These metals are extracted from mineral ores embedded in the Earth's crust after proper mining, concentration, and refining processes.
Q2. Find out where these minerals (used in toothpaste: silica, limestone, aluminium oxide, phosphate, fluorite, rutile, ilmenite, anatase, mica) are found?
Answer:
The occurrences of key toothpaste minerals in India include:
- Silica: Derived from quartz and sand deposits found across river beds and sedimentary rocks throughout India.
- Limestone: Found extensively in sedimentary rock formations across Madhya Pradesh, Rajasthan, Andhra Pradesh, and Chhattisgarh.
- Fluorite: Mined in Rajasthan (Mando-ki-Pal) and Gujarat (Ambadungar).
- Titanium Minerals (Rutile, Ilmenite, Anatase): Derived from heavy mineral beach sands of Kerala, Tamil Nadu, Odisha, and Andhra Pradesh.
- Mica: Mined predominantly in the Koderma-Gaya-Hazaribagh belt of Jharkhand, Ajmer in Rajasthan, and Nellore in Andhra Pradesh.
- Phosphate Minerals: Mined in Rajasthan (Rock Phosphate at Jhamarkotra) and Madhya Pradesh.
Q3. Dig a little deeper and find out how many minerals are used to make a light bulb?
Answer:
A standard incandescent/halogen light bulb uses several minerals for its components:
| Bulb Component | Metal / Mineral Used | Mineral Origin |
|---|---|---|
| Filament | Tungsten | Wolframite ore |
| Connecting Wires | Copper and Nickel | Chalcopyrite and Pentlendite |
| Base / Cap | Brass or Aluminium | Copper, Zinc, and Bauxite |
| Glass Bulb | Silica sand, Soda ash, Limestone | Sedimentary rocks and mineral deposits |
| Solder Joints | Tin and Lead | Cassiterite and Galena |
Q4. Dig a little deeper and collect “Nutritional Facts” printed on food labels.
Answer:
Essential minerals required by the human body printed on packaged food labels include:
- Calcium (Ca): Essential for bone and teeth health; sourced naturally from dairy and mineral salts.
- Iron (Fe): Key component of hemoglobin for oxygen transport in blood.
- Sodium (Na) & Potassium (K): Maintain electrolyte balance and nerve impulse transmission.
- Iodine (I): Vital for thyroid hormone production.
- Zinc (Zn) & Magnesium (Mg): Act as catalysts for hundreds of biochemical reactions in the body.
Q5. Dig a little deeper: What is the difference between an open pit mine, a quarry and an underground mine with shafts?
Answer:
The key structural differences between these mining methods are summarized below:
| Mining Type | Depth & Structure | Extraction Method | Commonly Mined Resources |
|---|---|---|---|
| Open-Pit Mine | Large, surface excavation forming a deep open pit with terraced benches. | Heavy earth-moving machinery excavates overburden and ore directly from the surface. | Iron ore, Bauxite, Copper, Coal. |
| Quarry | Shallow open-surface working, often open to the sky. | Cutting, blasting, or splitting blocks of stone from shallow faces. | Building stones like Granite, Marble, Limestone, Sandstone. |
| Underground Shaft Mine | Deep underground workings accessed via vertical shafts or inclined tunnels. | Elevators/hoists carry miners and equipment deep underground to extract ore along horizontal galleries. | Coal (deep seams), Gold, Lead, Zinc, Diamond. |
Q6. Superimpose the maps showing distribution of iron ore, manganese, coal and iron and steel industry. Do you see any correlation. Why?
Answer:
Correlation: Yes, there is a very strong spatial correlation between the locations of iron ore reserves, manganese deposits, coalfields, and the iron and steel plants in India (concentrated in the Chota Nagpur Plateau region covering Jharkhand, Odisha, Chhattisgarh, and West Bengal).
Reasons:
- Weight-losing Raw Materials: Both iron ore and coal are bulky, heavy, weight-losing raw materials. Transporting them over long distances significantly increases production costs.
- Proximity Requirement: Smelting one tonne of steel requires roughly 2 tonnes of iron ore, 1 tonne of coking coal, and about 10 kg of manganese. Locating steel industries close to the raw material source minimizes freight expenses.
Q7. Locate the mines of Bauxite on the physical map of India.
Answer:
Major Bauxite mining centers in India include:
- Odisha: Panchpatmali deposits in Koraput district (largest producer).
- Madhya Pradesh / Chhattisgarh: Amarkantak plateau, Maikal hills, and Bilaspur-Katni belt.
- Gujarat: Jamnagar, Junagadh, and Devbhoomi Dwarka districts.
- Maharashtra: Kolhapur and Ratnagiri districts.
Q8. Study the maps to explain why Chota Nagpur is a storehouse of minerals.
Answer:
The Chota Nagpur Plateau is known as the storehouse of minerals due to the following geological factors:
- Precambrian Gondwana & Dharwar Rock Formations: The plateau consists of ancient crystalline, metamorphic, and igneous rock strata rich in metallic ores.
- Rich Mineral Assemblage: It holds vast concentrated reserves of iron ore (Singhbhum), coal (Damodar Valley—Jharia, Raniganj, Bokaro), mica (Koderma-Hazaribagh), bauxite, manganese, and copper.
- Long Geological Stability: Millions of years of geological heat, pressure, and weathering facilitated deep mineral concentration without major tectonic disruptions.
Q9. Make a list of items where substitutes are being used instead of minerals. Where are these substitutes obtained from?
Answer:
Substitutes used in place of traditional mineral products include:
| Original Mineral Item | Substitute Material | Source of Substitute |
|---|---|---|
| Copper / Iron Pipes | PVC / Plastic Pipes | Petroleum / Petrochemical industry |
| Wooden / Metal Furniture | Synthetic Polymers / Fiberboard | Petrochemicals and processed wood pulp |
| Glass / Metal Containers | Biodegradable Bioplastics | Plant starches (Corn, Sugarcane) |
| Copper Wires (Communication) | Fiber Optic Cables | High-purity Silica (Glass/Quartz) |
Q10. Collect information about cross country natural gas pipelines laid by GAIL (India) under “One Nation One Grid”.
Answer:
Overview of GAIL's Cross-Country Gas Grid:
- Historic HVJ Pipeline: The 1,700 km Hazira-Vijaipur-Jagdishpur (HVJ) pipeline was India's first cross-country arterial gas pipeline connecting Gujarat to Northern India.
- Expansion: India's gas pipeline network has expanded from 1,700 km to over 18,500 km, targeting over 34,000 km to establish a unified National Gas Grid.
- Jagdishpur-Haldia & Bokaro-Dhamra Pipeline (Pradhan Mantri Urja Ganga): Extends natural gas accessibility to Eastern and North-Eastern states (Assam, Tripura, etc.).
- Key Purpose: Supplies natural gas to fertilizer plants, power stations, industrial clusters, and City Gas Distribution (CGD) networks for Compressed Natural Gas (CNG) and Piped Natural Gas (PNG).
Q11. Name some river valley projects and write the names of the dams built on these rivers.
Answer:
Major river valley projects in India and their associated dams include:
| River Valley Project | River | Dam Built | Key Beneficiary States |
|---|---|---|---|
| Bhakra-Nangal Project | Sutlej | Bhakra Dam & Nangal Dam | Punjab, Haryana, Rajasthan |
| Damodar Valley Project | Damodar | Tilaiya, Maithon, Panchet Dams | Jharkhand, West Bengal |
| Hirakud Project | Mahanadi | Hirakud Dam | Odisha |
| Narmada Valley Project | Narmada | Sardar Sarovar Dam | Gujarat, Madhya Pradesh, Maharashtra, Rajasthan |
| Chambal Valley Project | Chambal | Gandhi Sagar, Rana Pratap Sagar Dams | Madhya Pradesh, Rajasthan |
Q12. Collect information about thermal/hydel power plants located in your state. Show them on the map of India.
Answer:
Representative response for Assam / North-Eastern Region:
- Thermal Power Plants: Bongaigaon Thermal Power Station (NTPC), Namrup Thermal Power Station, Lakwa Thermal Power Station.
- Hydel Power Projects: Kopili Hydroelectric Project (NEEPCO), Karbi Langpi Hydroelectric Project.
Q13. Locate the 6 nuclear power stations and find out the state in which they are located.
Answer:
The six major operational nuclear power stations in India and their respective states are:
| Nuclear Power Station | State |
|---|---|
| Narora Nuclear Power Station | Uttar Pradesh |
| Rawatbhata Nuclear Power Station | Rajasthan |
| Kakrapar Nuclear Power Station | Gujarat |
| Tarapur Atomic Power Station | Maharashtra |
| Kudankulam / Kalpakkam Nuclear Power Station | Tamil Nadu |
| Kaiga Atomic Power Station | Karnataka |
Q14. Collect information about newly established solar power plants in India.
Answer:
Major large-scale ultra-mega solar power parks established in India include:
- Bhadla Solar Park (Rajasthan): One of the world's largest fully operational solar parks with a total capacity exceeding 2,245 MW.
- Pavagada Solar Park (Karnataka): Known as the 'Shakti Sthala', generating over 2,050 MW.
- Kurnool Ultra Mega Solar Park (Andhra Pradesh): Generates 1,000 MW of solar power.
- Rewa Ultra Mega Solar (Madhya Pradesh): A 750 MW grid-connected solar power plant supplying clean energy to regional utilities and the Delhi Metro system.
Exercises
Q1. Multiple choice questions. (i) Which one of the following minerals is formed by decomposition of rocks, leaving a residual mass of weathered material? (a) coal (b) bauxite (c) gold (d) zinc (ii) Koderma, in Jharkhand is the leading producer of which one of the following minerals? (a) bauxite (b) mica (c) iron ore (d) copper (iii) Minerals are deposited and accumulated in the stratas of which of the following rocks? (a) sedimentary rocks (b) metamorphic rocks (c) igneous rocks (d) none of the above (iv) Which one of the following minerals is contained in the Monazite sand? (a) oil (b) uranium (c) thorium (d) coal
Answer:
(i) (b) bauxite (Explanation: Bauxite forms through the surface decomposition of rocks rich in aluminium silicates, leaving behind a weathered residual mass.)
(ii) (b) mica (Explanation: The Koderma-Gaya-Hazaribagh belt of Jharkhand is the leading producer of mica in India.)
(iii) (a) sedimentary rocks (Explanation: Sedimentary minerals like coal, iron ore, gypsum, and salt occur in horizontal layers/strata due to deposition and accumulation.)
(iv) (c) thorium (Explanation: Monazite sands found along the coast of Kerala are rich in Thorium, used for generating nuclear power.)
Q2. Answer the following questions in about 30 words. (i) Distinguish between the following in not more than 30 words. (a) ferrous and non-ferrous minerals (b) conventional and non-conventional sources of energy (ii) What is a mineral? (iii) How are minerals formed in igneous and metamorphic rocks? (iv) Why do we need to conserve mineral resources?
Answer:
(i) (a) Ferrous vs Non-Ferrous Minerals:
| Ferrous Minerals | Non-Ferrous Minerals |
|---|---|
| Contain iron content (e.g., Iron ore, Manganese, Nickel). | Do not contain iron content (e.g., Copper, Bauxite, Gold, Zinc). |
| Provide the base for metallurgical industries. | Vital for electrical, engineering, and chemical industries. |
(i) (b) Conventional vs Non-Conventional Sources of Energy:
| Conventional Sources | Non-Conventional Sources |
|---|---|
| Traditional, non-renewable energy sources (e.g., Coal, Petroleum, Natural gas). | Modern, renewable energy sources (e.g., Solar, Wind, Tidal, Geothermal). |
| Cause high environmental pollution. | Eco-friendly and sustainable over the long term. |
(ii) Definition of a Mineral:
Geologists define a mineral as a homogeneous, naturally occurring substance with a definable internal crystalline structure. Minerals range from the hardest diamond to the softest talc.
(iii) Formation of Minerals in Igneous and Metamorphic Rocks:
In igneous and metamorphic rocks, minerals form when liquid, molten, or gaseous materials are forced upward through cracks, crevices, faults, or joints. They cool and solidify as they rise, forming smaller veins or larger lodes (e.g., Tin, Copper, Lead, Zinc).
(iv) Need for Conserving Mineral Resources:
Mineral resources are finite, non-renewable, and take millions of years to form. Rapid extraction causes depletion, rising extraction costs from greater depths, and lower ore quality. Conservation ensures sustainable industrial development for future generations.
Q3. Answer the following questions in about 120 words. (i) Describe the distribution of coal in India. (ii) Why do you think that solar energy has a bright future in India?
Answer:
(i) Distribution of Coal in India:
Coal is the most abundantly available fossil fuel in India and occurs in two major geological formations:
- Gondwana Coal Deposits (Over 200 million years old): Accounts for the bulk of metallurgical coal reserves. The primary coalfields are located in the Damodar Valley across Jharkhand and West Bengal (Jharia, Raniganj, Bokaro). Other major Gondwana coal-bearing river valleys include the Godavari, Mahanadi, Son, and Wardha valleys.
- Tertiary Coal Deposits (About 55 million years old): Contains younger, high-moisture coal found mainly in the North-Eastern states, including Meghalaya, Assam, Arunachal Pradesh, and Nagaland.
- Lignite Reserves: A low-grade brown soft coal found primarily at Neyveli in Tamil Nadu, extensively used for electricity power generation.
(ii) Why Solar Energy has a Bright Future in India:
Solar energy holds immense potential in India due to several strategic and geographical advantages:
- Tropical Location: India is a tropical country receiving abundant, continuous sunlight almost year-round (approx. 300 clear sunny days annually).
- Photovoltaic Technology Efficiency: Solar Photovoltaic (PV) technology directly converts sunlight into electricity, making decentralized power generation feasible in remote, off-grid rural areas.
- Rural Energy Substitution: Widespread adoption of solar energy reduces rural reliance on firewood and cattle dung cakes, preserving forests and freeing manure for agriculture.
- Government Focus & Cost Reduction: Mega projects like Bhadla and Pavagada solar parks, paired with declining solar panel prices, position solar energy as a key driver of clean energy transition.
Activity
Q1. Fill the name of the correct mineral in the crossword below: Clues Across: 1. A ferrous mineral (9) 2. Raw material for cement industry (9) 3. Finest iron ore with magnetic properties (9) 4. Highest quality hard coal (10) 5. Aluminium is obtained from this ore (7) 6. Khetri mines are famous for this mineral (6) 7. Formed due to evaporation (6) Clues Down: 1. Found in placer deposit (4) 2. Iron ore mined in Bailadila (8) 3. Indispensable for electrical industry (4) 4. Geological Age of coal found in north east India (8) 5. Formed in veins and lodes (3)
Answer:
The solved crossword terms matching the clues are detailed below:
| Type | Clue No. & Description | Identified Word | Letter Count |
|---|---|---|---|
| Across | 1. A ferrous mineral | MANGANESE | 9 |
| Across | 2. Raw material for cement industry | LIMESTONE | 9 |
| Across | 3. Finest iron ore with magnetic properties | MAGNETITE | 9 |
| Across | 4. Highest quality hard coal | ANTHRACITE | 10 |
| Across | 5. Aluminium is obtained from this ore | BAUXITE | 7 |
| Across | 6. Khetri mines are famous for this mineral | COPPER | 6 |
| Across | 7. Formed due to evaporation | GYPSUM | 6 |
| Down | 1. Found in placer deposit | GOLD | 4 |
| Down | 2. Iron ore mined in Bailadila | HEMATITE | 8 |
| Down | 3. Indispensable for electrical industry | MICA | 4 |
| Down | 4. Geological Age of coal found in north east India | TERTIARY | 8 |
| Down | 5. Formed in veins and lodes | TIN | 3 |