Vancouver's soil is naturally acidic because of the amount of rain that falls.
Rain is made of water, which is made of two hydrogen atoms and one oxygen atom (H2O). When the rain falls to earth, it breaks apart into H+ and HO-. Now the soil has more free H atoms which makes it more acidic.
The "H" is pH is for hydrogen. The "p" has a variety of possible explanations, including power or potential.
The more free H+ atoms in the soil, the lower the number due to a negative logarithmic equation.
This part can be confusing, but remember rain = more H+ in soil = high acidity = low pH.
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