* Sand: The largest particles, ranging from 0.05 to 2 millimeters in diameter.
* Silt: Medium-sized particles, ranging from 0.002 to 0.05 millimeters in diameter.
* Clay: The smallest particles, less than 0.002 millimeters in diameter.
In addition to these primary components, the inorganic part of soil can also contain:
* Rock fragments: Larger pieces of weathered rock, ranging from pebbles to boulders.
* Minerals: Specific chemical compounds with a defined crystal structure, often present as salts, oxides, and carbonates.
* Organic minerals: Minerals that are formed through biological processes.
* Other inorganic components: These include materials like glass, metal, and concrete that are not naturally occurring.
The specific composition of the inorganic part of soil varies depending on the parent rock material, climate, and other factors. The proportions of sand, silt, and clay determine the soil's texture, which influences its ability to hold water, nutrients, and air.
