Petersburg, West Virginia. Petersburg is a city in Grant County, West Virginia, USA. The population was 2,467 at the 2010 census. It is the county seat of Grant County. Contents.
The particles that make up soil are categorized into three groups by size: sand, silt, and clay. Sand particles are the largest and clay particles the smallest. Although a soil could be all sand, all clay, or all silt, that's rare. Instead most soils are a combination of the three.
Soil is a material composed of five ingredients â minerals, soil organic matter, living organisms, gas, and water. Soil minerals are divided into three size classes â clay, silt, and sand (Figure 1); the percentages of particles in these size classes is called soil texture.