The cross section below shows a rock sequence Which event ...
(2) Late Archean (3) Middle Proterozoic (4) Late Proterozoic A whalebone that originally contained 200 grams of radioactive carbon-14 now contains 25 grams of carbon-14. How many carbon-14 half-lives have passed since this whale was alive? (1) 1 (3) 3 (2) 2 (4) 4 Scientists believe that a large asteroid struck ................
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