Class V

What is one difference between a common organic fuel such as wood, and a fossil fuel?
  1. Wood burns more slowly
  2. Fossil fuels burn faster
  3. Fossil fuels make more efficient fuels
  4. Wood is in higher demand
Natural gas is composed mainly of which type of gas?
  1. propane
  2. methane
  3. butane
  4. ethane
What is the one continent on Earth where coal is not found?
  1. Africa
  2. North America
  3. Australia
  4. Antarctica
Why do fossil fuels generate more power than wood for use in machines, for example?
  1. Fossil fuels have a higher concentration of carbon and hydrogen
  2. Fossil fuels are drier
  3. Fossil fuels are easier to light
  4. Fossil fuels are easier to transport
The quality of coal, called its rank, is a measure of which of the following characteristics?
  1. The quality of coal, called its rank, is a measure of which of the following characteristics?
  2. amount of oxygen in the coal
  3. how black it is
  4. how hard it is
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