What Is Dirt Made Out Of?
A single tablespoon of soil contains more organisms there are people on Earth.
What is dirt made out of? - Big Questions (Ep. 15)
from Mental Floss
Key Facts In This Video
Soil and dirt aren't the same thing. (0:14)
Around 45 percent of soil consists of three main components. (0:51)
In the U.S. alone there are about 50,000 different types of soil. (1:24)