Things you will need:
Three cup drinking glasses
Lemon juice
Vinegar
Water
3 pieces of chalk
1. Pour 1/2 glass lemon juice into glass 1. Pour 1/2 glass vinegar into glass 2, and pour 1/2 glass water into glass three
2. Put 1 piece of chalk into each of the glasses. Make sure part of the chalk is in the liquid.
3. Place the glasses where they won't be knocked over.
4. Check on the glasses over the next few days. What is happening?
The chalk dissolves in the vinegar and in the lemon juice. When humans release carbon dioxide in the air, it dissolves into raindrops and makes rain become naturally acidic. Over time, rainfall which can dissolve and erode rocks. The chalk you used in the experiment is made of the rock limestone or calcium carbonate. When acids react with limestone, they eat away at the rock and start to break it apart. Lemon juice and vinegar are acids. They are much stronger than acid rain, so erosion happens more quickly. You can see how acid rain can affect rocks over hundreds and thousands of years.
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