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.
Tarmac is not widely used on roads any more, or ramps. That material is known as asphalt. Most large airports actually use concrete. Some county rural roads are actually paved with a tarmac like, or chip and seal like material over crushed rock.o anon82548: No one said asphalt is not used on airports. Of course it is, and in the manner you stated. Tarmac is not asphalt -- similar, but different! The term tarmac is only used by the clueless when talking about modern and/or US airports.