Researchers estimate that the Pacific Ocean contains at least 46 pounds of floating microplastic pieces (microbeads) that originate from hand cleaners, exfoliating facial scrubs, and toothpaste, that are known to transport pollutants and be eaten by fish.

Answer is million.

Refer below.

Explanation:

Researchers estimate that the Pacific Ocean contains at least 46 million pounds of floating microplastic pieces (microbeads) that originate from hand cleaners, exfoliating facial scrubs, and toothpaste, that are known to transport pollutants and be eaten by fish.

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.

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