Class VII

Coal, crude, petroleum and natural gas are examples of
  1. elements
  2. elements
  3. fossils fuel
  4. compounds
Buried plants due to constant heat and pressure turn in to
  1. wood
  2. coal
  3. fertilizer
  4. oil
Need and demand of fossil fuels can be reduced by
  1. conserving energy
  2. storing energy
  3. utilizing energy
  4. transforming energy
Fossils fuels are rich in carbon and
  1. nitrogen
  2. hydrogen
  3. nitrogen
  4. oxygen
Plankton buried under heat and pressure over a long period of time is turned in to
  1. crude oil
  2. natural gas
  3. coal
  4. kerosene
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