where do metals come from? give three points.

Dear Student,

a.  Earth's crust is made of different minerals from where we extract different metals, metals like aluminium , copper occur in earth's crust
b. Then,  they  may occur as alluvial deposits in sands of valley floors and the base of hills. These deposits are called placer deposits and generally contain minerals which are not corroded by water. 
Eg- Gold, silver, tin, platinum etc. They are usually found the result of gravity separation during sedimentary process. They may also include heavy mineral sands generally found in beach environment
c. Also from  plateaus,  which are
 endowed with rich deposits of industrial minerals like iron ore, bauxite, gold , copper.
Ores are concentrations of minerals in rock combined with other elements and high enough to be economically extracted for use. 



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Hey Harshdeep,
Most pure metals, like aluminium, silver and copper, come from the Earth s crust.

They are found in ores solid materials called minerals, usually occurring in rock, from which the pure metal has to be extracted.

The properties of pure metals can be improved by mixing them with other metals to make alloys.

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from earth's crust!!!
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