What two elements make up about 99 percent of the air?

What two elements make up about 99 percent of the air?

  • Correct Answer: nitrogen and oxygen
  • phosphorus and oxygen
  • nitrogen and phosphorus
  • helium and boron

Explanation: Nitrogen and oxygen make up about 99 percent of the air. Argon and carbon dioxide make up much of the rest. The air also contains water vapor. The amount of water vapor varies from place to place.

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