Examlex
The correct sequence going from smallest to largest is
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.
Flammable
Easily ignited and capable of burning rapidly; used to describe substances that pose a significant fire risk.
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