A State by State Licensure Guide. SocialWorkLicensure.org provides state specific social work licensure and certification requirements including education requirements, exam requirements, reciprocity licensure information, and professional organization contacts.
Coal mining generates significant adverse environmental impacts. Historically, coal mining has been a very dangerous activity and the list of historical coal mining disasters is a long one. Underground mining hazards include suffocation, gas poisoning, roof collapse and gas explosions.
US Economy. Coal is a sedimentary black or dark brown rock that varies in composition. Some types of coal burn hotter and cleaner while others contain high moisture content and compounds that contribute to acid rain and other pollution when they're burned. Coals of varying composition are used as a combustible fossil fuel for generating electricity and producing steel around the world.