# of Half-LivesHalf-Life of Carbon-14 Age of Rock (years old) % of Carbon Remaining % of Nitrogen 0 1 2 3 4 5 6
Example of Half Life Your rock contains 3 grams of C 14 and 9 grams of N 14. How old is your rock? -
Example of Half Life A sample of wood that originally contained 100 grams of carbon 14 now only contains 25 grams of carbon 14. Approximately how many years ago was this sample part of a living tree? -
Example of Half Life A rock contains 5 grams of Uranium 238 and 35 grams of Lead 206. How old is the rock? -
Example of Half Life A fossil contains 5 grams of carbon 14 and 75 grams of Nitrogen 14. How old is the fossil? -
Final Question: A rock containing Potassium 40 undergoes 3 half lives, what is the age of the rock? -
Final Question: The geologic history of an area can best be inferred by studying A) erosional processes affecting the area B) plants and animals now living in the area C) present climatic conditions of the area D) bedrock compositions and rock structures in the area
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