Students will then apply their observations to the larger world by downloading actual data from the USGS and plot the average acidity for several communities throughout the United States. The first site offers a lesson plan on the harmful effects of acid rain. The USGS site offers background information, maps, graphs, and pH charts.
Students can download the actual data.
Students will make observations and record them into a journal. Students should observe the physical and chemical properties of the material being used. They should look for any patterns that may occur and how they may affect events in the environment. Students should be able to describe any changes that occur during the testing. For an extension have students measure the pH levels of common products such as, lemon juice, vinegar, apple juice, tomato juice, milk, and pure water.