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What can be done to promote regular exercise in children?
Ozone-Depleting Substances
Ozone-Depleting Substances are chemicals that cause the depletion of the ozone layer, which protects the Earth from harmful ultraviolet radiation.
Pre-1950 Ozone Levels
The concentration of ozone in the Earth's stratosphere before the significant increase in human-made emissions affecting the ozone layer.
Earth
The third planet from the Sun, uniquely supporting life within the solar system.
Chlorofluorocarbons
A group of man-made chemical compounds containing chlorine, fluorine, and carbon, historically used in refrigeration and aerosol propellants, but now known to deplete the ozone layer.
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