Sentence Examples


  • Petroleum and natural gas also occur in the plateau rocks in great quantities.
  • - The state's great mineral wealth is in coals of various kinds, petroleum, and natural gas.
  • Petroleum was collected for use in the most remote ages of which we have any records.
  • As early as 1804, Humboldt expressed the opinion that petroleum was produced by distillation from deep-seated strata, and Karl Reichenbach in 1834, suggested that it was derived from the action of heat on the turpentine of pine-trees, whilst Brunet, in 1838, adumbrated a similar theory of origin on the ground of certain laboratory experiments.
  • Deposits of copper, tin, iron and tungsten have been discovered, and a variety of other mineral products (graphite, mica, spodumene, coal, petroleum, &c.).