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Soils are extremely important parts of every ecosystem. They are a home to many microbes and provide vital nutrients to the plants that live in them. pH is the measure of acidity or alkalinity of a solution, and most organisms have a very small range of pH values in which they can survive. 7 is considered neutral, lower than 7 is acidic (lemon juice, rain water) and above 7 is basic (bleach, soap).
Lots of urban areas are dependent on car transportation, and at the present time, most of our cars run on gasoline. It has already been documented that burning gasoline produces greenhouse gases that contribute to warming in our atmosphere, and byproducts have been linked to asthma and cancer. Do gas stations also pollute the soil around them?
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