The ground-level ozone is a harmful air pollutant that can be a danger to one's health. It is commonly created by chemical between oxides and nitrogen. Similar to ground-level ozone, smog can also be a danger to one's health, especially to the lungs. It is a mixed smoke and fog.
Answer:
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Explanation:
An ore is a naturally occurring solid material from which a metal or valuable minerals can be extracted profitably. They are found from underground which means you have to dig then out.
They are like silvers and gold