Small business self-certification, a one-year certification which requires annual renewal, is a prerequisite for verification as a Small Diverse Business. Visit smallbusiness.pa.gov for program guidelines, Frequently Asked Questions (FAQs), and step-by-step instructions for the self-certification process.
The main uses for coal are Fuels, Plastics and Electricity.
The layers of coal are called peat, lignite, subbituminous, bituminous caol, and anthracite. Peat being the most inexpensive and anthracite being the most valuable. Most coal â¦ in use is bituminous.    Another answer: A layer of coal in a mine is called a coal seam. 7 people found this useful.eat being the most inexpensive and anthracite being the most valuable. Most coal â¦ in use is bituminous.     Another answer: A layer of coal in a mine is called a coal seam. 7 people found this useful.