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| Minerals and Ores |
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| Metals and their compounds are found in earth as natural elements known as minerals. Ores are minerals from which metals are extracted at low cost with minimum effort. Ores contains metal compounds with a percentage of impurities. All the ores are minerals, but all the minerals are not ores. |
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 Metals like gold and platinum occur in the free metallic form not acted upon by air or water |
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The rest of the metals occur in the combined form as compounds. Copper is one of the metals which occur in free as well as combined state |
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Aluminium is the most abundant metal in the earth's crust |
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The second most abundant metal in the earth is iron and the third one is calcium |
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