(par 6.3.2.1.1.5) Petrolium (WWF)
Petroleum http://wwf.panda.org/about_our_earth/teacher_resources/webfieldtrips/climate_change/petroleum/ © WWF / Peter Prokosch Petroleum literally means ‘rock oil’. It exists in the upper strata of the Earth’s crust, and is mainly a complex mixture of hydrocarbons.…