the "solid ground" we walk on is only about 50% solid — made mostly of minerals and 1-10% organic matter. the remaining 50% is open, pore space — filled with either air or water.
soils are the foundation of nearly every ecosystem on the planet, providing important services that give rise to healthy plants, healthy people, and a healthy planet!
"essentially, all life depends upon the soil... there can be no life without soil and no soil without life; they have evolved together." -charles kellogg
through a combination of physical, biological, and chemical processes, rocks break down into smaller and smaller pieces.
- rocks either weather in place or are deposited in one of the following ways:
- rocks are composed of different types of minerals that weather at different rates