state reason along with an example that why is it quite difficult to get apure substance?
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In the core of the earth due to high temperature, high pressure and bundance of mixed minerals in the soil, the metals get oxidized, or combine with the other elements to attain a stable state in extreme conditions under the ground.
Thus, it is very rare to find a pure substance in the environment in free state. It is possible only in case of noble elements.
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