Petroleum (L. petroleum, from Greek: petra (rock) + Latin: oleum (oil)) or crude oil is a naturally occurring, flammable liquid consisting of a complex mixture of ...The industry includes the global processes of exploration, extraction, refining, transporting (often by oil tankers and pipelines), and marketing ...Précis élémentaire de. Matière Médicale Homéopathique. Professeur Timothy Field Allen Traduction : Dr Robert Séror. PETROLEUM. Généralités : (Petroleum) ...Petroleum or crude oil is a fossil fuel. Find out how petroleum was formed and a brief history of its development into the oil products we see today.
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