Rocks- A rock is made up of 2 or more minerals. You need minerals to make rocks, but you don't need rocks to make minerals. All rocks are made of minerals.
For example, granite is a mixture of the minerals quartz, feldspar, and biotite.
Some rocks made of only  one mineral like Limestone made of calcite 

Minerals- A mineral is composed of the same substance throughout. There are more than 3000 different minerals in the world. Minerals are made of chemicals - either a single chemical element or a combination of chemical elements.
Difference between rock and mineral- A rock is made up of 2 or more minerals, whereas a mineral is composed of the same substance throughout.

Ore- A mineral occurring in sufficient quantity and containing enough metal to permit its recovery and extraction at a profit. Or, a mineral or an aggregate of minerals from which a valuable constituent, especially a metal, can be profitably mined or extracted is an ore.
Metal- An alloy of two or more metallic elements.

Therefore, Rocks have minerals, which in large concentration are called ores and these are mined for metals!
 
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