Other questions in this quiz

2. What % of the Earth's atmosphere is mainly nitrogen and oxygen?

  • 99%
  • 90%
  • 98%

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

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

4. Coal is a carbon. In a plentiful air supply it burns to form .....

  • Carbon
  • carbon dioxide
  • soot

5. Pollutants are released by natural processes such as ______ and by human activity such as _____

  • volcanoes and burning fuels
  • Burning fuels and volcanoes

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