Which factors allowed europe to be a dominant force in world events in the nineteenth and twentieth centuries?

common language
economic development
military superiority
mountainous landscape
political power

radiative zone

explanation    

radiative zone is the layer of the sun which energy is transferred away from the core by radiation. although, the core is the only part of the sun that produces an appreciable amount of heat through fusion. in fact, 99% of the energy produced by the sun takes place within 24% of the sun's radius.