State any two main characteristics of a rock.
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Two important features of rocks are: Rocks vary in shape, size and colour. They are composed of various minerals which are in turn composed of chemical elements. These minerals form the rocks which generally are produced under tremendous heat and pressure conditions deep underground.
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Rocks are classified according to characteristics such as mineral and chemical composition, permeability, texture of the constituent particles, and particle size. These physical properties are the result of the processes that formed the rocks.
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