Examlex
The rapid growth of chain stores occurred during the 1940's.
Great Plains
A broad expanse of flat land, covered in prairie, steppe, and grassland, located in the central United States and Canada.
Chlorofluorocarbons (CFCs)
Man-made chemical compounds once used in air conditioning, refrigeration, and aerosol propellants, known to deplete the ozone layer.
Propellants
Substances that are used to propel an object by generating a gas under pressure.
Sea Levels
The average height of the ocean's surface, used as a baseline in measuring land elevation and ocean depth.
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