Minerals and Energy Resources
Minerals and energy power our industries and daily lives, but they are limited and must be used wisely. This Class 10 Geography chapter classifies minerals and explains how they occur, then surveys India's conventional and non-conventional sources of energy and the need to conserve them.
Learning objectives
- Classify minerals into types.
- Describe how minerals occur and are conserved.
- Distinguish conventional and non-conventional energy.
- Explain the need for energy conservation.
Key concepts
Types of minerals
Minerals are classified as metallic and non-metallic. Metallic minerals include ferrous ones containing iron, such as iron ore and manganese, and non-ferrous ones such as copper and bauxite. Non-metallic minerals include mica and limestone. Mineral fuels such as coal and petroleum are energy minerals.
Occurrence and conservation of minerals
Minerals occur in veins and lodes in igneous and metamorphic rocks, in beds and layers in sedimentary rocks, and as alluvial (placer) deposits in sands of valley floors. Since minerals take millions of years to form and are exhaustible, they must be conserved through careful use, recycling and the use of substitutes.
Conventional sources of energy
Conventional sources have been used for a long time and include firewood, coal, petroleum, natural gas and electricity. Electricity is generated mainly as thermal power (from coal, gas), hydroelectric power (from flowing water) and nuclear power (from minerals like uranium). Many of these are non-renewable and polluting.
Non-conventional sources of energy
Non-conventional sources are renewable and cleaner, including solar, wind, tidal, geothermal energy and biogas. India, with abundant sunshine and long coastlines, has great potential for solar and wind energy. Increasing their use reduces pollution and the strain on limited fossil fuels.
Key definitions
- Mineral
- A naturally occurring substance with a definite chemical composition.
- Ferrous mineral
- A metallic mineral that contains iron, such as iron ore.
- Conventional energy
- Long-used energy sources like coal, petroleum and electricity.
- Non-conventional energy
- Renewable, cleaner sources like solar, wind and tidal energy.
Solved examples
Q1. Give one ferrous and one non-ferrous metallic mineral.
Solution: Ferrous: iron ore; non-ferrous: copper.
Q2. Name two non-conventional energy sources.
Solution: Solar and wind energy.
Q3. How is hydroelectric power generated?
Solution: From the energy of flowing or falling water.
Common mistakes to avoid
- Confusing ferrous (iron-containing) with non-ferrous minerals.
- Calling solar and wind energy conventional sources.
- Forgetting that minerals are exhaustible and need conservation.
- Mixing up thermal and hydroelectric power.
Minerals and Energy Resources — MCQ Quiz
10 questions with instant feedback. Use number keys 1–4 to answer.
Minerals containing iron are:
Practice questions
Short answer
What are ferrous minerals?
Metallic minerals that contain iron, such as iron ore and manganese.
Name two non-conventional energy sources.
Solar and wind (also tidal, geothermal, biogas).
Why must minerals be conserved?
They are exhaustible and take millions of years to form.
Long answer
Classify minerals with examples and describe how they occur.
Minerals are broadly classified into metallic and non-metallic types. Metallic minerals are those from which metals are obtained; they are further divided into ferrous minerals, which contain iron such as iron ore and manganese, and non-ferrous minerals, which do not, such as copper, bauxite and gold. Non-metallic minerals, such as mica and limestone, do not yield metals. In addition, mineral fuels like coal and petroleum are energy minerals. Minerals occur in different forms: in veins and lodes within cracks of igneous and metamorphic rocks, in beds or layers formed by deposition in sedimentary rocks, and as alluvial or placer deposits in the sands of valley floors where they have been washed down and concentrated.
Compare conventional and non-conventional sources of energy.
Energy sources are grouped as conventional and non-conventional. Conventional sources have been used for a long time and include firewood, coal, petroleum, natural gas and electricity; electricity is produced mainly as thermal power by burning coal or gas, as hydroelectric power from flowing water, and as nuclear power from minerals like uranium. Many conventional sources are non-renewable and cause pollution. Non-conventional sources are renewable and far cleaner, and include solar, wind, tidal, geothermal energy and biogas. India is well placed to use them, with plentiful sunshine for solar energy and a long coastline and windy areas for wind energy. Shifting towards non-conventional sources reduces pollution and eases the pressure on limited fossil fuels, making development more sustainable.
HOTS (Higher Order Thinking)
Why is it important for India to develop solar and wind energy?
Because they are renewable and clean, and India has abundant sunshine and windy coastal areas, so they can reduce dependence on limited, polluting fossil fuels.
How does recycling metals help conserve minerals?
Recycling reuses metals already extracted, reducing the need to mine fresh ore and thus conserving exhaustible mineral reserves.
Quick revision
Revision notes
- Minerals: metallic (ferrous: iron, manganese; non-ferrous: copper, bauxite), non-metallic (mica, limestone), fuels (coal, petroleum).
- Occurrence: veins/lodes, beds, placer (alluvial) deposits.
- Conventional energy: coal, petroleum, gas, thermal/hydel/nuclear electricity.
- Non-conventional: solar, wind, tidal, geothermal, biogas (renewable, clean).
Key takeaways
- Minerals are exhaustible and need conservation.
- Electricity comes from thermal, hydro and nuclear sources.
- Non-conventional energy is clean and renewable.
Frequently asked questions
What is the difference between ferrous and non-ferrous minerals?
Ferrous minerals contain iron; non-ferrous metallic minerals do not.
Is solar energy conventional or non-conventional?
Non-conventional (renewable).
How is thermal power generated?
By burning coal or gas to produce electricity.