‘रचना-प्रयोग’ का मुख्य उद्देश्य क्या है?

व्याकरण का व्यावहारिक प्रयोग सिखाना

‘द्वितीयः’ किस प्रकार की संख्या है?

क्रमवाचक (दूसरा)

How do minerals occur in nature?

In rocks as ores — in veins and lodes in igneous and metamorphic rocks, in beds and layers in sedimentary rocks, and as alluvial or placer deposits in sands.

Why is it important to conserve minerals?

Because minerals are exhaustible and take millions of years to form, so unchecked use will rapidly deplete this finite resource.

Distinguish between conventional and non-conventional sources of energy.

Conventional sources include coal, petroleum and firewood, while non-conventional sources are renewable, such as solar, wind, tidal and geothermal energy.

Why should India develop non-conventional sources of energy?

To reduce pollution and dependence on exhaustible fossil fuels and to ensure clean, sustainable energy for the growing economy.

Distinguish between ferrous and non-ferrous minerals.

Ferrous minerals contain iron, such as iron ore and manganese, while non-ferrous minerals do not, such as copper, bauxite and gold.

How do minerals occur in nature?

As ores in rocks — in veins and lodes in igneous and metamorphic rocks, in beds and layers in sedimentary rocks, and as alluvial (placer) deposits in sands.

Distinguish between ferrous and non-ferrous minerals.

Ferrous minerals contain iron, such as iron ore and manganese, while non-ferrous minerals do not, such as copper, bauxite and gold.

Why is it important to conserve minerals?

Because minerals are exhaustible and take millions of years to form, so unplanned use will quickly deplete this finite resource.

Distinguish between conventional and non-conventional sources of energy.

Conventional sources like coal, petroleum and firewood are traditional and often exhaustible, while non-conventional sources like solar, wind and tidal energy are renewable.

Why should India develop non-conventional sources of energy?

To reduce pollution and dependence on exhaustible fossil fuels and to ensure clean, sustainable energy for the growing economy.

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Chapter 5: Minerals and Energy ResourcesClass 10 Social Science — summary, notes, extra questions & NCERT solutions

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Iron ore and manganese are examples of:

Summary

This chapter studies minerals and the energy that powers the economy. A mineral is a naturally occurring substance with a definite chemical composition, found in rocks as ores in veins and lodes, in beds and layers, and as alluvial or placer deposits. Minerals are classified as metallic — ferrous (iron ore, manganese) and non-ferrous (copper, bauxite) — non-metallic (mica, limestone) and energy minerals (coal, petroleum). The chapter describes their distribution and uses across India and stresses that, because minerals are exhaustible and take ages to form, they must be conserved through planned and efficient use and recycling. The second part covers energy resources, both conventional — coal, petroleum, natural gas, electricity (thermal and hydro) and firewood — and non-conventional — solar, wind, tidal, geothermal, biogas and nuclear energy. It highlights the need to shift towards renewable and clean energy to cut pollution, reduce dependence on fossil fuels and ensure sustainable development.

What minerals are and how they occurClassification of mineralsDistribution and uses of key mineralsConservation of mineralsConventional energy resourcesNon-conventional energy resources

Key terms

Mineral

A naturally occurring substance with a definite chemical composition.

Ore

A rock or mineral from which a metal can be profitably extracted.

Ferrous minerals

Minerals that contain iron, such as iron ore and manganese.

Non-ferrous minerals

Metallic minerals without iron, such as copper, bauxite and gold.

Conventional energy

Traditional energy sources such as coal, petroleum and firewood.

Non-conventional energy

Renewable energy from sources like the sun, wind, tides and geothermal heat.

Placer deposits

Minerals found as alluvial deposits in sands of valley floors.

Conservation of minerals

Planned, efficient use and recycling so that minerals last longer.

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A naturally occurring substance with a definite chemical composition.

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Chapter 5: Minerals and Energy ResourcesClass 10 Social Science — summary, notes, extra questions & NCERT solutions

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