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Polycyclic Aromatic Hydrocarbons
A lot of oil and petroleum by products fall into this category as well, specifically a class of compounds called polycyclic aromatic hydrocarbons. The origin of this material is fido plankton or algy that gets buried at the bottom of the ocean,. After some number of thousands or millions of yearsat all, that kind of just turns into this liquid material That's what eventually getsi pulled out of the earth as crude oil.