The ozone layer protects living things on Earth from

Most air pollution comes from

Nearly half of the pollution caused by burning fossil fuels comes from

One thing people in the United States could do to reduce air pollution is

The greenhouse effect is

The freezing point of pure water on the Celsius scale is

Heat transfer between two substances that are in contact is called

Heat from the sun reaches you by

Convection takes place because

Winds are caused by differences in

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