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Law of Superposition

Review of concepts

QuestionAnswer
How have scientists been able to put earth's timeline together? The fossil record
How long is earth's timeline? 4.6 billion years
What is the Law of Superposition. The youngest fossils are on the _________ and the oldest fossils are on the __________. The youngest fossils are on the top and the oldest fossils are on the bottom.
Why does the basic law of superposition not always work? Disturbances
What is the disturbance that cut across several layers. It is younger than the layers it crosses. Cross-Cutting
What is the disturbance where magma comes up and hardens (usually in between a layer/several layers) Intrusion
What is a crack that offsets the layers Fault
What is the kind of dating that we can do through the law of superposition. Example: The brachiopod is older than the trilobite but younger than the reptile. relative dating
What is the kind of dating that we cannot do because we would need to calculate the specific age of the fossils. absolute dating
What is the amount of years that it takes for an element to be cut in half. half life
What is the kind of absolute dating where scientists calculate the amount of carbon 14 remaining in a fossil in order to know the age of the fossil. carbon dating
What does carbon 14 start to change into once something dies? Nitrogen 14
What is the half life for carbon? 5, 730 years
Created by: johnsone21
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