Biggest lake In the world?

Caspian Sea

Explanation:

The Caspian Sea in Asia is the largest lake in the world, with an area of 143,000 sq miles.

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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.