The function of a city and its location are directly related to each other, especially during ancient times. If so, which of the following is not true ?

Answer volcanic outgassing;

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

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Most of the land is used for housing/commercial uses