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In this activity (on page 8), learners model how marble statues and buildings are affected by acid rain.

In this online interactive simulation, learners will test the pH of liquids like coffee, spit, and soap to determine whether each is acidic, basic, or neutral.

In this experiment, learners try different liquids to see which ones clean pennies best. Liquids to try include water, lemon juice, cola, vinegar, and dishwashing detergent.

In two separate bags, learners mix water with Epsom salts and detergent.