The part of the atmosphere that contains the majority of the air that we breathe.

Keep practicing — related questions

• In which layer of the atmosphere is most of the air present?
• The majority (78%) of the atmosphere is __________ gas.
• 21% of the atmosphere is _______________.
• The air we breathe consists ____ nitrogen, oxygen, carbon dioxide, and several other gases.
• Ozonosphere is the upper part of:
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