PLEASE HELP ME Compare the per capita GDP of the countries of North Eurasia. What might explain the difference?

Differences in real GDP across countries can come from differences in population, physical capital, human capital, and technology. After controlling for differences in labor, physical capital, and human capital, a significant difference in real GDP across countries remains.

Geologists use  seismic waves to  locate an earthquake's epicenter.. 

Water flows along the east coast and across the western tropical pacific towards south america, while they both are directed towards that way,  el niño does not directly affect the southern flow of water along the coast.