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.
Understanding Soil Nutrients / 33 Structure. The size and arrangement of structural pieces called soil aggregates (the crumbs or chunks of soil) affect the amount and types of pores the soil has, and therefore strongly influence water and oxygen storage and movement through the soil. Internal Drainage.