En qué ciudades se concentran entre 10 y 20 millones de habitantes

Tokio ,Nueva York , Ciudad de México , sao paolo ,Delhi ,Bombay , Manila ,shangai, Los Angeles

Magma is outside the volcano  and lava is inside the volcano. 

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