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Learners add acid rain (nitric acid) to two cups that represent lakes. One cup contains limestone gravel and the other contains granite gravel.

In this activity, learners test exhaled breath for carbon dioxide and learn how to use an indicator as a simple way to measure pH.

In this activity, learners perform an experiment to find out what determines a flower's color.

Learners discover that their breath contains carbon dioxide, one of the pollutants found in car exhaust.