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5 Cards in this Set

  • Front
  • Back
What is the name given to the envelope of gases surrounding our planet?
The atmosphere
The discovery of oxygen is credited to what two men?
Scheele and Priestley
Who discovered nitrogen?
Daniel Rutherford
What percentage of the atmosphere is oxygen? nitrogen?
Approximately 21% is oxygen, and about 78% is nitrogen.
What are the names of the two layers of the atmosphere, based upon composition?
The homosphere and the heterosphere.