Gap Fill - Clean Air - Level 4

HOW TO PLAY:

  • Choose the correct word from the drop-down menus below.
  • Click the button at the bottom to check your answers.
  • Press the "refresh" button on your browser to play again.
  • After this paragraph, go to Paragraph 2.

   activity      aerosols      air      clouds      continents      pristine      purity      research      south      they  

Paragraph 1

Scientists found what think is the cleanest on Earth. Researchers conducted on the of the air above Antarctica. An area between the of Australia and Antarctica was "unaffected" by human . The analysis of the air in the showed it was free from "anthropogenic ". These are pollutants from human activity, or dust from other . The scientists called this pollution-free area, "truly ".

Now go to   Paragraph 2.

Back to the clean air lesson.

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