Suffix[edit] -al. of or pertaining to; adjectival suffix appended to various words, often nouns, to make an adjective form. Often added to words of Latin origin, but used with other words also.
Remember: there is a difference between soil and dirt. Dirt is what you get on your clothes and hands while working in the soil. Soil is made up of elements that have been decomposing since the earth was created. Soil is composed of bedrock and mountain stones broken down over eons by wind and rain.
Clay soil contains from 40 to 100 percent clay. As the amount of clay, sand or silt in loam increases, it may be classified as a clay loam, sandy loam or silty loam.