An epidemic occurs when an infectious disease spreads rapidly to many people. For example, in 2003, the severe acute respiratory syndrome (SARS) epidemic took the lives of nearly 800 people worldwide. disease outbreak happens when a disease occurs in greater numbers than expected in a community or region or during a season. An outbreak may occur in one community or even extend to several countries. It can last from days to years. Sometimes a single case of a contagious disease is considered an outbreak.
Quick Answer. Bitumen is primarily used to pave roads. It is a brown or black mixture of hydrocarbons, which is derived from petroleum. The consistency of bitumen varies from viscous to solid, and in its solid form, it is commonly known as asphalt. Continue Reading.
Along with melting ice, placing salt on icy roads also helps to provide a bit of traction for the tires even as the ice is beginning to melt back into water. The grainy nature of the salt allows the treads on the tires to grip the surface of the road, thus minimizing the chances for sliding or fishtailing on the road.ven table salt can be used to melt ice from walkways and sidewalks. Salting icy roads can minimize skidding during winter driving. Salt helps increase traction on roads while at the same time preventing water from freezing.