The PRSSS is creating a custom card deck with soil facts. Contribute your favourite soil facts here!
Your submission enters you into a draw for a free card deck!
The deadline for contributions is Monday January 20th, 2020.
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.
Note: if you find your fact from a source (e.g. journal article, textbook, website), please rephrase it in your own words!