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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