Paving materials are used to create a durable and attractive surface for roads, driveways, and other outdoor areas. CEMENT is a common paving material made from a mixture of limestone, clay, and other materials that is heated to form a rock-like substance. ASPHALT is a black, sticky material made from petroleum products that is often used for roads and driveways. TAR is a dark, viscous material made from coal or wood that is used to waterproof surfaces. FLAGSTONE is a flat, sedimentary rock that is often used for patios and walkways. MACADAM is a type of road construction that uses crushed stone and gravel. Bluestone is a type of sandstone that is often used for paving and landscaping. COBBLESTONE is a type of paving material made from rounded stones that are usually set in sand or mortar.