10 dirty secrets
About SOIL!
Source: https://www.audubon.org/news/10-incredible-facts-about-dirt

Fact 1:
There are 70,000 different types
of soil in the U.S.

Fact 2:
1 Tablespoon of soil has
more organisms in it than
there are people on earth

Facts 3 & 4:
• 1,400,000 Earthworms can be found in an acre
of cropland
• 15 tons of dry soil per acre pass through one
earth worm each year

Fact 5:
10% of the world’s carbon dioxide
emissions are stored in the soil

Fact 6:
The top six inches of an
acre of top soil contains
20,000 pounds of living
matter

Facts 7 & 8:
• Soil acts as a filter for underground water,
filtering out pollutants
• .01% of Earth’s water is held in soil

Fact 9:
Soil supports our planet’s
biodiversity and they host a quarter
of the total

Fact 10:
At least 500 years is
needed to form one inch
of top soil

Free Ebook:
Digging into Soil Science
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www.holganix.com/download-the-digging-
into-soil-sciences-101-ebook