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The type of current produced by a battery is direct current. C.
This question is personal preference... just answer with whatever YOU think, there probably isn’t s wrong answer if I’d guess.
The estimation of the age of the Earth comes from scientists who studied the rock formation under the Earth's crust. They believe that during the Big Bang, the Earth, together with the other celestial bodies in the universe, were formed. Under the Earth's soil contain radioactive materials that have known decay rates. Using these rate, they undergo tests like rock dating to find the time of its existence.
