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 mixture of four materials: weathered rock particles, organic. matter, water, and air. Weathered rock particles are the main ingredient. of soil. Soils differ, depending on what types of rock the rock particles. came fromâfor example, granite or limestone.