| http://www.w3.org/ns/prov#value | - The diamond, graphite, anthracite, the coals, lignites, and, lastly, wood and other vegetable matter all form carbonic acid when burned ; but from some of them hydrogen and its compounds, especially hydrocarbons, are also evolved, a regular series thus existing through the bituminous and cannel coals to the true hydrocarbon minerals, such as petroleum and mineral wax.
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