Besides primary gases, there are trace and variable gases that make up __ of the atmosphere.

Beside the primary gases , the trace and variable gases make up 1 % of the atmosphere.

The main part of atmosphere consist of 78 % of Nitrogen and 21 % of Oxygen , while other gases such as neon ,Helium , and Argon only covered up the rest 1 %

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The us is first  the  u.s. economy  remains the  largest in the world  in terms of nominal  gdp. however, the  u.s. economy  loses its spot as the number one  economy  to china when  measured  in terms of  gdp  based on ppp. in these terms, china's  gdp  is $23.19 trillion exceeds the  u.s. gdp  of $19.42 trillion