O governo dos estados unidos investiu na contrucao do canal do panama para

Melhorar o comércio e o fluxo marítimo entre os países do lado oeste do Canal do Panamá e os países do lado leste.

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.