Explanation: A mineral is a naturally occurring substance with a definite chemical composition and an orderly internal (crystalline) structure. It is formed by natural geological processes, not man-made, and can occur in all types of rocks.

Explanation: Minerals form through slow geological processes over millions of years. Human consumption is much faster than their natural rate of formation, so on the human time scale they behave as non-renewable resources.

Explanation: An ore is a rock containing a mineral in such quantity that it can be extracted economically. The key idea is profitability, not just the mere presence of a mineral.

Explanation: In igneous and metamorphic rocks, mineral-bearing solutions fill cracks and crevices and solidify as veins (small deposits) or lodes (larger deposits). Tin, copper, zinc and lead are often extracted from such deposits.

Explanation: Minerals like coal, limestone and some iron ores occur in beds and layers in sedimentary rocks, formed by the deposition, compaction and cementation of sediments over long periods.

Explanation: Placer deposits are alluvial deposits where heavy minerals like gold, tin and platinum get concentrated in sands of river beds or valley floors. They are important because extraction is relatively easy from these loose sediments.

Explanation: Bauxite is a residual deposit formed when rocks are intensely chemically weathered in a hot and humid climate. Heavy rainfall causes leaching, removing soluble materials and leaving behind aluminium-rich bauxite.

Explanation: The Chhota Nagpur Plateau (Jharkhand, Odisha, Chhattisgarh, parts of West Bengal) is India’s richest mineral belt, especially in coal, iron ore, manganese, bauxite and mica. This is why many heavy industries are located there.

Explanation: The North-Western Region (Rajasthan–Gujarat) is rich in non-metallic minerals like limestone, gypsum, mica and rock phosphate, as well as salt. This supports cement and chemical industries in the region.

Explanation: Ferrous minerals are minerals which contain iron, such as iron ore, manganese and chromite. They form the backbone of the iron and steel industry.

Explanation: Hematite is the most important industrial iron ore in India and contains about 60–70% iron. It is widely used in the iron and steel industry.

Explanation: Manganese is used as a ferro-alloy to remove impurities such as sulphur and oxygen and to make steel hard and tough. It is also used in dry cell batteries and paints.

Explanation: Copper is a non-ferrous mineral and an excellent conductor of electricity and heat. It is widely used in electrical wiring, cables and electronic equipment.

Explanation: Bauxite is the chief ore of aluminium. Aluminium is light, strong and corrosion-resistant, so it is used in aircraft, vehicles, packaging and household utensils.

Explanation: Mica is a non-metallic mineral that is a very good insulator, can withstand high temperatures and can be split into thin sheets. Therefore it is used widely in electrical and electronic industries.

Explanation: Limestone is the basic raw material for the cement industry. It is also used as a flux in the iron and steel industry to remove impurities.

Explanation: Exporting minerals quickly at cheap rates (option c) leads to rapid depletion of mineral reserves. Conservation measures include recycling metals, improving mining technology and using substitutes to reduce pressure on resources.

Explanation: Coal is a traditional conventional source of energy and is widely used in thermal power plants in India to generate electricity. Solar, wind and tidal energy are non-conventional sources.

Explanation: Wind energy uses the kinetic energy of moving air to rotate wind turbines, which drive generators to produce electricity. It is a clean and renewable source of energy.

Explanation: Using public transport or car-pooling reduces the number of vehicles on the road, thereby saving petrol and diesel and cutting air pollution. Simple lifestyle choices like this significantly help in conserving energy resources.