PRSSS Playing Card Fact Collection
The Pacific Regional Soil Science Society is making a custom deck of playing cards with different fun soil facts on each card. Help us share our love and knowledge of soils by submitting your favourite soil fact!

Example facts:

Every teaspoon of soil has more microorganisms than there are people on earth.

The rate of topsoil formation can vary from <0.25 mm/year in dry and cold environments to 1.5 mm/year in humid and warm environments. Topsoil formation at the rate of 1 mm/year is equivalent to an annual addition of 12 t/ha.
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