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There is much more to soil than the small mineral particles some refer to as dirt. Soil is composed of mineral matter, water, air, and even organic matter. Each of these soil components has its own physical and chemical properties. The way these components interact together make soil a dynamic substrate in which we grow plants. Changes occurring to soil depth, site, climate, and other factors affect the properties of soil which are conducive to plant growth.
To begin understanding the basics of soil, review the following fact sheets.
Take a closer look at soil texture in the following articles:
Take a closer look at soil structure and individual aggregate types or peds: