If erosion stripped the top off a dome one would find

One would find the oldest rocks were exposed at the center if erosion stripped the top off a dome. Erosion is the action of the surface processes that can be caused by natural elements such as wind and water flow that removes soil, rock, or dissolved material from one location on the Earth's crust to another location.

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