SOIL
What is soil?
About 95 percent of soil is crushed rock minerals (crystals of sand, silt and clay), about five percent is organic matter (things that have been alive at some point), and about 0.5–1 percent is living microbes. Up to 25 percent of living soil is air, by volume, and vital for healthy soil.
How is soil made?
Lichens, fungi, worms and microbes can help
