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6. In a limited supply of air Coal burns to form...

  • Soot
  • Carbon Monoxide
  • Carbon Dioxide

7. Elements are made of

  • molecules
  • electrons
  • atoms
  • cells

8. The remaining % of the air is mainly ...

  • Argon with tiny amounts of carbon dioxide and other gases
  • Carbon dioxide with tiny amounts of argon and other gases
  • Other gases with tiny amounts of argon and carbon dioxide

9. How were the oceans formed?

  • the first atmosphere cooled and water vapour condensed
  • it rained and filled where the oceans are now

10. The Earth's atmosphere was probably formed by ...

  • The heat from the sun
  • Volcanic Activity
  • The big bang