Why are crude oil reserve estimates somewhat unreliable?

all reserve estimates involve uncertainty due to the interpretation of geologic data.

some countries falsify data for political reasons.

the original estimates are almost always low and tend to grow with time.

all of the above.

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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