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
ANS (b) bauxite

Koderma, in Jharkhand is the leading producer of which one of the following minerals?
(a) bauxite
(b) mica
(c) iron ore
(d) copper
ANS (b) mica

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
ANS (a) sedimentary rocks

Which one of the following minerals is contained in the Monazite sand?
(a) oil
(b) uranium
(c) thorium
(d) coal
ANS (c) thorium

Ferrous minerals	Non-ferrous minerals
Metallic minerals which contain iron are called ferrous minerals, e.g. iron ore, manganese, nickel, cobalt, etc.	Metallic minerals which do not contain iron are called non-ferrous minerals, e.g. copper, bauxite, tin, etc.

Conventional Sources of Energy	Non-conventional Sources of Energy
Conventional sources of energy are those sources which have been use since the early times.	Non-conventional sources of energy have generally been identified in the recent past.
They cause pollution when used as they emit smoke and ash.	Generally these are pollution-free.
Their generation and use involve huge expenditure.	Low expenditure required.
Very expensive to maintain, store, transmit as they are carried over long distances through transmission grids.	Less expensive due to local use and easy maintenance.
Examples are � coal, natural gas, water, fire-wood.	Examples are � geothermal energy, solar energy, wind energy, tidal energy, biogas energy, nuclear energy.

A mineral is a homogeneous, naturally occurring substance with a definable interior structure.

In igneous and metamorphic rocks, molten/liquid and gaseous minerals are forced upwards into the cracks. They then solidify and form veins or lodes.