Natural disaster produced by volcanic activity that has killed more people than lava flows is

Lava flow is actually quite slow, and in most cases you can outrun lava.

What kills people in the case of volcanic activity is either

-Pyroclastic Flows (hot air and ash traveling fast)
or
-landslides or mudslides - those often kill entire villages since they can happen far from the volcano too.

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