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ES Quiz

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QuestionAnswer
A whalebone that originally contained 200 g of radioactive c14 now contains 25 g of c14. How many c14 half lives have passed? 3
What is the inferred age of our solar system? 4600
State one characteristic of a good index fossil. They are found in many locations and lived for a short period of time.
What is a half life? Th time it takes for half of the atoms to decay into the stable daughter product.
What is the half life of C14? 5700 years
What is the half life of Uranium 238? 4.5 billion years
What does U 238 decay lead into? Lead 206
What are the names of two Eons of Geologic time? Precambrian and Phanerozoic
What is the age of the oldest known rocks? 400 billion
What is the half life of Potassium 40? 1.3 billion
The time a particular atom of C14 will decay. Unpredictable
The time requried for half of the atoms in a large sample of C14 to change it its decay product. Predictable
What is an uncomformity? A gap in the rock record. Some piece of the rock record is missing.
What is correlation? A process that allows us to st show that rocks or geologic events in different locations are similar in age or the same time.
Created by: angelgilrxoxo
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