This is the largest river ( by volume of water) in the world and it runs through the north regions of South America

This is the amazon river

Explanation: This is the greatest river of South America and the largest drainage system in the world in terms of the volume of its flow and the area of its basin.

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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.