5. What makes the Amazon Rainforest a physical region?

Its physical characteristics that result from proximity to the equator provide mostly moist dense tropical forests, but also include habitats such as montane, palm, bamboo, lowland and floodplain forests, grasslands and swamps.

Explanation:

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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.