Rocks form the crust or lithosphere or rock sphere of our Earth. Petrology is study f Rocks. Iron, Oxygen,Silica, Magnesium form the 90% of the total mass of the crust. The most abundant element in the earth crust oxygen; and the most abundant mineral is silicon.
More than one element constitute to form the mineral, and minerals organize to form rocks. the important groups of minerals forming the rocks are silicates, carbonates, sulfides, metal oxides, etc.
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