<P> The Age of Oil , also known as the Oil Age or the Petroleum Age , refers to the era in human history characterised by an increased use of petroleum in products and as fuel . Though unrefined petroleum has been used for various purposes since ancient times , it was during the 19th century that refinement techniques were developed and gasoline engines were created . </P>
what are the characteristics of the age of oil
increased use of petroleum in products and as fuel