Which of the following is considered a pollutant?

Besides gasses, we also are breathing in:

Water in the form of a gas is called:

In order to be considered an acid, a substance must have a pH:

How is most air pollution produced?

The condition of Earth's atmosphere in a particular time and place is called:

The layer of Earth that contains only water is the:

An instrument used to measure air pressure is a:

As elevation increases, air pressure:

Air is most dense at:

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