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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.

1 cent - $1 per group Ages 14 - adult 5 to 10 minutes

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In this activity (on page 2 of the PDF), learners explore surface tension by adding pennies to cups which are "full" of plain water or soapy water.

1 cent - $1 per student Ages 6 - 14 5 to 10 minutes