Acid rain, also known as "acid deposition", is something we all have heard about, but it is common to not fully understand what it means. Astringent precipitation is simply rain, but with a higher concentration of acidity, meaning a lower pH value. You see, all rain has a slight level of acidity as a result of mixing with naturally occurring oxides in the air.

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PH values range on a scale from 0 to 14, with 0 being the most acidic and 14 being the most alkaline. Normal rain has…