| http://www.w3.org/ns/prov#value | - Our familiarity with oil can obstruct recognition of how remarkable a substance it is: oil took millions of years to form from the remains of marine and other organisms; it is only found in a limited number of locations where a specific combination of geological conditions coincide; it possesses an unequalled combination of high energy per unit mass and per unit volume; and it is both highly flexi
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