Coal in Australia. Right now, coal is Australiaâs primary fuel source for generating electricity at around 73 percent. Black coal is found across Australia. Brown coal, sometimes called lignite, is a relatively soft material, which has a heating value of about one-quarter of black coal.
noun. The definition of abrasive is something that is harsh or rough, often to an unpleasant degree. An example of abrasive is the attitude of your boss who is always short tempered and yelling at you. Sand paper or SOS pads are examples of abrasives.
A Guide to Dental Terms. Abrasion - Loss of tooth structure caused by a hard toothbrush, poor brushing teeth technique or bruxism (grinding or clenching the teeth). Abscess - An infection of a tooth, soft tissue or bone. Abutment - tooth or teeth that support a fixed or removable tooth bridge. Adhesive Dentistry - Contemporary term for dental restorations that involve bonding of composite resin or porcelain fillings to natural teeth. Air Abrasion - Removal of tooth structure by blasting a tooth with air and abrasive, a relatively new technology that may avoid the need for anesthetic.