Need an excuse to indulge in a lobster dinner tonight? In the United States, June 15 is National Lobster Day, a time for savoring and paying tribute to one of Americaâs most beloved crustaceans. In honor of the holiday, check out these shell-shocking facts about lobster and its long, meaty history. â¢ When the first European settlers reached North America, lobsters were so plentiful that they would reportedly wash ashore in piles up to 2 feet high.
An abrasive is a material, often a mineral, that is used to shape or finish a workpiece through rubbing which leads to part of the workpiece being worn away. coated abrasive comprises an abrasive fixed to a backing material such as paper, cloth, rubber, resin, polyester or even metal, many of which are flexible. Sandpaper is a very common coated abrasive.
Abrasion is the grinding and wearing away of rock surfaces through mechanical means of other rock/sand particles. This process can be understood with how a piece of chalk works. As you scrape a piece of chalk against a board to draw/write, particles of the piece of chalk rub off to make a line on the board and the piece of chalk wears down and gradually becomes smaller.